From 97b5f22a7075e8a124b01309e7ba0e3ed7e910c1 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 15 Jun 2026 07:40:45 +0000
Subject: [PATCH 1/8] When redrawing a whole pane line, fall into tty_draw_line
 for any characters that are not plain ASCII. Fixes redraw issues with partial
 tabs and other wide characters when a pane is partly outside the window.

---
 screen-write.c | 62 +++++++++++++++++++++++++++++++++++++++-----------
 tmux.h         |  1 +
 tty.c          | 20 ++++++++++++++++
 3 files changed, 70 insertions(+), 13 deletions(-)

diff --git a/screen-write.c b/screen-write.c
index a5be7fe9..fbef8320 100644
--- a/screen-write.c
+++ b/screen-write.c
@@ -1127,6 +1127,25 @@ screen_write_backspace(struct screen_write_ctx *ctx)
 	screen_write_set_cursor(ctx, cx, cy);
 }
 
+/* Is this cell a single ASCII character? */
+static int
+screen_write_cell_is_single(const struct grid_cell *gc)
+{
+	if (gc->data.width != 1)
+		return (0);
+	if (gc->data.size != 1)
+		return (0);
+	if (*gc->data.data < 0x20 || *gc->data.data == 0x7f)
+		return (0);
+	if (gc->flags & GRID_FLAG_CLEARED)
+		return (0);
+	if (gc->flags & GRID_FLAG_PADDING)
+		return (0);
+	if (gc->flags & GRID_FLAG_TAB)
+		return (0);
+	return (1);
+}
+
 /* Redraw all visible cells on a line. */
 static void
 screen_write_redraw_line(struct screen_write_ctx *ctx, struct tty_ctx *ttyctx,
@@ -1135,11 +1154,14 @@ screen_write_redraw_line(struct screen_write_ctx *ctx, struct tty_ctx *ttyctx,
 	struct window_pane	*wp = ctx->wp;
 	struct screen		*s = ctx->s;
 	struct grid_cell	 gc, ngc;
-	u_int			 sx = screen_size_x(s), cx, i, n;
+	u_int			 sx = screen_size_x(s), cx, i;
 	int			 xoff = wp->xoff, yoff = wp->yoff;
 	struct visible_ranges	*r;
 	struct visible_range	*ri;
 
+	if (s->mode & MODE_SYNC)
+		return;
+
 	r = screen_redraw_get_visible_ranges(wp, xoff, yoff + yy, sx, NULL);
 	for (i = 0; i < r->used; i++) {
 		ri = &r->ranges[i];
@@ -1147,20 +1169,34 @@ screen_write_redraw_line(struct screen_write_ctx *ctx, struct tty_ctx *ttyctx,
 			continue;
 
 		cx = ri->px - xoff;
-		for (n = 0; n < ri->nx && cx < sx; n++, cx++) {
-			grid_view_get_cell(s->grid, cx, yy, &gc);
-			if (~gc.flags & GRID_FLAG_SELECTED)
-				ttyctx->cell = &gc;
-			else {
-				screen_select_cell(s, &ngc, &gc);
-				ttyctx->cell = &ngc;
-			}
+		if (cx >= sx)
+			continue;
+		if (cx + ri->nx > sx)
+			ttyctx->n = sx - cx;
+		else
+			ttyctx->n = ri->nx;
+		if (ttyctx->n == 0)
+			continue;
+		ttyctx->ocx = cx;
+		ttyctx->ocy = yy;
 
-			ttyctx->ocx = cx;
-			ttyctx->ocy = yy;
-			if (~s->mode & MODE_SYNC)
-				tty_write(tty_cmd_cell, ttyctx);
+		if (ttyctx->n != 1) {
+			tty_write(tty_cmd_redrawline, ttyctx);
+			continue;
 		}
+
+		grid_view_get_cell(s->grid, cx, yy, &gc);
+		if (!screen_write_cell_is_single(&gc)) {
+			tty_write(tty_cmd_redrawline, ttyctx);
+			continue;
+		}
+		if (~gc.flags & GRID_FLAG_SELECTED)
+			ttyctx->cell = &gc;
+		else {
+			screen_select_cell(s, &ngc, &gc);
+			ttyctx->cell = &ngc;
+		}
+		tty_write(tty_cmd_cell, ttyctx);
 	}
 }
 
diff --git a/tmux.h b/tmux.h
index 20b3c228..5be1a809 100644
--- a/tmux.h
+++ b/tmux.h
@@ -2697,6 +2697,7 @@ void	tty_write(void (*)(struct tty *, const struct tty_ctx *),
 void	tty_cmd_alignmenttest(struct tty *, const struct tty_ctx *);
 void	tty_cmd_cell(struct tty *, const struct tty_ctx *);
 void	tty_cmd_cells(struct tty *, const struct tty_ctx *);
+void	tty_cmd_redrawline(struct tty *, const struct tty_ctx *);
 void	tty_cmd_clearendofline(struct tty *, const struct tty_ctx *);
 void	tty_cmd_clearendofscreen(struct tty *, const struct tty_ctx *);
 void	tty_cmd_clearline(struct tty *, const struct tty_ctx *);
diff --git a/tty.c b/tty.c
index ef4dcd25..bb7c0ae8 100644
--- a/tty.c
+++ b/tty.c
@@ -1430,6 +1430,26 @@ tty_draw_pane(struct tty *tty, const struct tty_ctx *ctx, u_int py)
 	}
 }
 
+void
+tty_cmd_redrawline(struct tty *tty, const struct tty_ctx *ctx)
+{
+	u_int			 i, x, rx, ry, j;
+	struct visible_ranges	*r;
+	struct visible_range	*rr;
+
+	if (tty_clamp_line(tty, ctx, ctx->ocx, ctx->ocy, ctx->n,
+	    &i, &x, &rx, &ry)) {
+		r = tty_check_overlay_range(tty, x, ry, rx);
+		for (j = 0; j < r->used; j++) {
+			rr = &r->ranges[j];
+			if (rr->nx == 0)
+				continue;
+			tty_draw_line(tty, ctx->s, i + rr->px - x,
+			    ctx->ocy, rr->nx, rr->px, ry, &ctx->style_ctx);
+		}
+	}
+}
+
 /* Check if character needs to be mapped for codeset. */
 const struct grid_cell *
 tty_check_codeset(struct tty *tty, const struct grid_cell *gc)

From 7a18fa281db3745024d36d000e7bc45eac8978f1 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 15 Jun 2026 08:16:05 +0000
Subject: [PATCH 2/8] Add top-floating and bottom-floating to
 pane-border-status to show status line only on floating panes.

---
 format.c        |  6 ++----
 options-table.c |  4 ++--
 screen-redraw.c | 46 +++++++++++++++++++++++++++-------------------
 server-client.c |  2 +-
 tmux.1          |  7 ++++++-
 tmux.h          |  4 +++-
 window.c        | 28 ++++++++++++++++++++++++----
 7 files changed, 65 insertions(+), 32 deletions(-)

diff --git a/format.c b/format.c
index d0f8518f..4d58c40b 100644
--- a/format.c
+++ b/format.c
@@ -1143,15 +1143,13 @@ static void *
 format_cb_pane_at_top(struct format_tree *ft)
 {
 	struct window_pane	*wp = ft->wp;
-	struct window		*w;
 	int			 status, flag;
 	char			*value;
 
 	if (wp == NULL)
 		return (NULL);
-	w = wp->window;
 
-	status = window_get_pane_status(w);
+	status = window_pane_get_pane_status(wp);
 	if (status == PANE_STATUS_TOP)
 		flag = (wp->yoff == 1);
 	else
@@ -1173,7 +1171,7 @@ format_cb_pane_at_bottom(struct format_tree *ft)
 		return (NULL);
 	w = wp->window;
 
-	status = options_get_number(w->options, "pane-border-status");
+	status = window_pane_get_pane_status(wp);
 	if (status == PANE_STATUS_BOTTOM)
 		flag = (wp->yoff + (int)wp->sy == (int)w->sy - 1);
 	else
diff --git a/options-table.c b/options-table.c
index 90c8fb57..d24b90b3 100644
--- a/options-table.c
+++ b/options-table.c
@@ -71,7 +71,7 @@ static const char *options_table_pane_scrollbars_position_list[] = {
 	"right", "left", NULL
 };
 static const char *options_table_pane_status_list[] = {
-	"off", "top", "bottom", NULL
+	"off", "top", "bottom", "top-floating", "bottom-floating", NULL
 };
 static const char *options_table_pane_border_indicators_list[] = {
 	"off", "colour", "arrows", "both", NULL
@@ -1374,7 +1374,7 @@ const struct options_table_entry options_table[] = {
 
 	{ .name = "pane-border-status",
 	  .type = OPTIONS_TABLE_CHOICE,
-	  .scope = OPTIONS_TABLE_WINDOW,
+	  .scope = OPTIONS_TABLE_WINDOW|OPTIONS_TABLE_PANE,
 	  .choices = options_table_pane_status_list,
 	  .default_num = PANE_STATUS_OFF,
 	  .text = "Position of the pane status lines."
diff --git a/screen-redraw.c b/screen-redraw.c
index 95436501..3f04e74c 100644
--- a/screen-redraw.c
+++ b/screen-redraw.c
@@ -125,7 +125,8 @@ screen_redraw_pane_border(struct screen_redraw_ctx *ctx, struct window_pane *wp,
 {
 	struct options	*oo = wp->window->options;
 	int		 ex = wp->xoff + wp->sx, ey = wp->yoff + wp->sy;
-	int		 hsplit = 0, vsplit = 0, pane_status = ctx->pane_status;
+	int		 hsplit = 0, vsplit = 0;
+	int		 pane_status = window_pane_get_pane_status(wp);
 	int		 pane_scrollbars = ctx->pane_scrollbars, sb_w = 0;
 	int		 sb_pos, sx = wp->sx, sy = wp->sy;
 	enum layout_type split_type;
@@ -296,7 +297,7 @@ screen_redraw_cell_border(struct screen_redraw_ctx *ctx, struct window_pane *wp,
 	}
 
 	/* Outside the window or on the window border? */
-	if (ctx->pane_status == PANE_STATUS_BOTTOM)
+	if (window_pane_get_pane_status(wp) == PANE_STATUS_BOTTOM)
 		sy--;
 	if (px > sx || py > sy)
 		return (0);
@@ -327,7 +328,8 @@ screen_redraw_type_of_cell(struct screen_redraw_ctx *ctx,
 {
 	struct client	*c = ctx->c;
 	struct window	*w = c->session->curw->window;
-	int		 pane_status = ctx->pane_status, borders = 0;
+	int		 pane_status = window_pane_get_pane_status(wp);
+	int		 borders = 0;
 	int		 sx = w->sx, sy = w->sy;
 
 	/* Is this outside the window? */
@@ -435,7 +437,7 @@ screen_redraw_check_cell(struct screen_redraw_ctx *ctx, int px, int py,
 	struct window		*w = c->session->curw->window;
 	struct window_pane	*wp, *start;
 	int			 sx = w->sx, sy = w->sy;
-	int			 pane_status = ctx->pane_status;
+	int			 pane_status;
 	int			 border, pane_scrollbars = ctx->pane_scrollbars;
 	int			 pane_status_line, tiled_only = 0, left, right;
 	int			 sb_pos = ctx->pane_scrollbars_pos, sb_w;
@@ -511,6 +513,7 @@ screen_redraw_check_cell(struct screen_redraw_ctx *ctx, int px, int py,
 		 * Pane border status inside top/bottom border is CELL_INSIDE
 		 * so it doesn't get overdrawn by a border line.
 		 */
+		pane_status = window_pane_get_pane_status(wp);
 		if (pane_status != PANE_STATUS_OFF) {
 			if (pane_status == PANE_STATUS_TOP)
 				pane_status_line = wp->yoff - 1;
@@ -593,13 +596,19 @@ screen_redraw_make_pane_status(struct client *c, struct window_pane *wp,
 	struct format_tree	*ft;
 	struct style_line_entry	*sle = &wp->border_status_line;
 	char			*expanded;
-	int			 pane_status = rctx->pane_status, sb_w = 0;
+	int			 pane_status = window_pane_get_pane_status(wp);
+	int			 sb_w = 0;
 	int			 pane_scrollbars = rctx->pane_scrollbars;
 	int			 max_width;
 	u_int			 width, i, cell_type, px, py;
 	struct screen_write_ctx	 ctx;
 	struct screen		 old;
 
+	if (pane_status == PANE_STATUS_OFF) {
+		wp->status_size = 0;
+		return (0);
+	}
+
 	if (window_pane_show_scrollbar(wp, pane_scrollbars))
 		sb_w = wp->scrollbar_style.width + wp->scrollbar_style.pad;
 
@@ -673,7 +682,7 @@ screen_redraw_draw_pane_status(struct screen_redraw_ctx *ctx)
 	struct visible_ranges	*r;
 	struct visible_range	*ri;
 	u_int			 i, l, x, width, size;
-	int			 xoff, yoff;
+	int			 xoff, yoff, pane_status;
 
 	log_debug("%s: %s @%u", __func__, c->name, w->id);
 
@@ -683,7 +692,10 @@ screen_redraw_draw_pane_status(struct screen_redraw_ctx *ctx)
 		s = &wp->status_screen;
 
 		size = wp->status_size;
-		if (ctx->pane_status == PANE_STATUS_TOP)
+		pane_status = window_pane_get_pane_status(wp);
+		if (pane_status == PANE_STATUS_OFF)
+			continue;
+		if (pane_status == PANE_STATUS_TOP)
 			yoff = wp->yoff - 1;
 		else
 			yoff = wp->yoff + wp->sy;
@@ -754,16 +766,14 @@ screen_redraw_update(struct screen_redraw_ctx *ctx, uint64_t flags)
 	if (c->overlay_draw != NULL)
 		flags |= CLIENT_REDRAWOVERLAY;
 
-	if (ctx->pane_status != PANE_STATUS_OFF) {
-		lines = ctx->pane_lines;
-		redraw = 0;
-		TAILQ_FOREACH(wp, &w->panes, entry) {
-			if (screen_redraw_make_pane_status(c, wp, ctx, lines))
-				redraw = 1;
-		}
-		if (redraw)
-			flags |= CLIENT_REDRAWBORDERS;
+	lines = ctx->pane_lines;
+	redraw = 0;
+	TAILQ_FOREACH(wp, &w->panes, entry) {
+		if (screen_redraw_make_pane_status(c, wp, ctx, lines))
+			redraw = 1;
 	}
+	if (redraw)
+		flags |= CLIENT_REDRAWBORDERS;
 
 	return (flags);
 }
@@ -787,7 +797,6 @@ screen_redraw_set_context(struct client *c, struct screen_redraw_ctx *ctx)
 		ctx->statustop = 1;
 	ctx->statuslines = lines;
 
-	ctx->pane_status = window_get_pane_status(w);
 	ctx->pane_lines = options_get_number(w->options, "pane-border-lines");
 
 	ctx->pane_scrollbars = options_get_number(w->options,
@@ -824,8 +833,7 @@ screen_redraw_screen(struct client *c)
 	if (flags & (CLIENT_REDRAWWINDOW|CLIENT_REDRAWBORDERS)) {
 		log_debug("%s: redrawing borders", c->name);
 		screen_redraw_draw_borders(&ctx);
-		if (ctx.pane_status != PANE_STATUS_OFF)
-			screen_redraw_draw_pane_status(&ctx);
+		screen_redraw_draw_pane_status(&ctx);
 		screen_redraw_draw_pane_scrollbars(&ctx);
 	}
 	if (flags & CLIENT_REDRAWWINDOW) {
diff --git a/server-client.c b/server-client.c
index c3d04c3b..35a505b1 100644
--- a/server-client.c
+++ b/server-client.c
@@ -614,7 +614,7 @@ server_client_check_mouse_in_pane(struct window_pane *wp, int px, int py,
 
 	sb = options_get_number(w->options, "pane-scrollbars");
 	sb_pos = options_get_number(w->options, "pane-scrollbars-position");
-	pane_status = window_get_pane_status(w);
+	pane_status = window_pane_get_pane_status(wp);
 
 	if (window_pane_show_scrollbar(wp, sb)) {
 		sb_w = wp->scrollbar_style.width;
diff --git a/tmux.1 b/tmux.1
index 87cdb70d..40f74d95 100644
--- a/tmux.1
+++ b/tmux.1
@@ -5638,9 +5638,14 @@ and
 will fall back to standard ACS line drawing when UTF\-8 is not supported.
 .Pp
 .It Xo Ic pane\-border\-status
-.Op Ic off | top | bottom
+.Op Ic off | top | bottom | top\-floating | bottom\-floating
 .Xc
 Turn pane border status lines off or set their position.
+If set to
+.Ic top\-floating
+or
+.Ic bottom\-floating ,
+status lines are shown only on floating panes.
 .Pp
 .It Ic pane\-border\-style Ar style
 Set the pane border style for panes aside from the active pane.
diff --git a/tmux.h b/tmux.h
index 5be1a809..11590bc1 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1078,7 +1078,6 @@ struct screen_redraw_ctx {
 	u_int		 statuslines;
 	int		 statustop;
 
-	int		 pane_status;
 	enum pane_lines	 pane_lines;
 
 	int		 pane_scrollbars;
@@ -1416,6 +1415,8 @@ TAILQ_HEAD(winlink_stack, winlink);
 #define PANE_STATUS_OFF 0
 #define PANE_STATUS_TOP 1
 #define PANE_STATUS_BOTTOM 2
+#define PANE_STATUS_TOP_FLOATING 3
+#define PANE_STATUS_BOTTOM_FLOATING 4
 
 /* Pane scrollbars option. */
 #define PANE_SCROLLBARS_OFF 0
@@ -3474,6 +3475,7 @@ int		 window_get_bg_client(struct window_pane *);
 enum client_theme window_pane_get_theme(struct window_pane *);
 void		 window_pane_send_theme_update(struct window_pane *);
 int		 window_get_pane_status(struct window *);
+int		 window_pane_get_pane_status(struct window_pane *);
 struct style_range *window_pane_status_get_range(struct window_pane *, u_int,
 		     u_int);
 int		 window_pane_is_floating(struct window_pane *);
diff --git a/window.c b/window.c
index 8b00dd1a..4ab5ca32 100644
--- a/window.c
+++ b/window.c
@@ -2126,16 +2126,14 @@ struct style_range *
 window_pane_status_get_range(struct window_pane *wp, u_int x, u_int y)
 {
 	struct style_ranges	*srs;
-	struct window		*w;
 	u_int			 line;
 	int			 pane_status;
 
 	if (wp == NULL)
 		return (NULL);
-	w = wp->window;
 	srs = &wp->border_status_line.ranges;
 
-	pane_status = window_get_pane_status(w);
+	pane_status = window_pane_get_pane_status(wp);
 	if (pane_status == PANE_STATUS_TOP)
 		line = wp->yoff - 1;
 	else if (pane_status == PANE_STATUS_BOTTOM)
@@ -2153,7 +2151,29 @@ window_pane_status_get_range(struct window_pane *wp, u_int x, u_int y)
 int
 window_get_pane_status(struct window *w)
 {
-       return (options_get_number(w->options, "pane-border-status"));
+	int	status;
+
+	status = options_get_number(w->options, "pane-border-status");
+	if (status == PANE_STATUS_TOP_FLOATING ||
+	    status == PANE_STATUS_BOTTOM_FLOATING)
+		return (PANE_STATUS_OFF);
+	return (status);
+}
+
+int
+window_pane_get_pane_status(struct window_pane *wp)
+{
+	int	status;
+
+	if (!window_pane_is_floating(wp))
+		return (window_get_pane_status(wp->window));
+
+	status = options_get_number(wp->options, "pane-border-status");
+	if (status == PANE_STATUS_TOP_FLOATING)
+		return (PANE_STATUS_TOP);
+	if (status == PANE_STATUS_BOTTOM_FLOATING)
+		return (PANE_STATUS_BOTTOM);
+	return (status);
 }
 
 int

From a41e6e2ed23f386da5630e6db379fadb477442c3 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 15 Jun 2026 09:21:40 +0000
Subject: [PATCH 3/8] Add -B to new-pane to select the floating pane border.

---
 cmd-split-window.c | 24 ++++++++++++++++++++----
 options-table.c    |  2 +-
 screen-redraw.c    |  7 ++++++-
 tmux.1             |  4 ++++
 tmux.h             |  1 +
 window.c           | 12 ++++++++++++
 6 files changed, 44 insertions(+), 6 deletions(-)

diff --git a/cmd-split-window.c b/cmd-split-window.c
index 1c9eaae9..ee3eeb4c 100644
--- a/cmd-split-window.c
+++ b/cmd-split-window.c
@@ -39,9 +39,10 @@ const struct cmd_entry cmd_new_pane_entry = {
 	.name = "new-pane",
 	.alias = "newp",
 
-	.args = { "bc:de:EfF:hIkl:Lm:p:PR:s:S:t:T:vWx:X:y:Y:Z", 0, -1, NULL },
-	.usage = "[-bdefhIklPvWZ] [-c start-directory] [-e environment] "
-		 "[-F format] [-l size] [-m message] [-p percentage] "
+	.args = { "bB:c:de:EfF:hIkl:Lm:p:PR:s:S:t:T:vWx:X:y:Y:Z", 0, -1, NULL },
+	.usage = "[-bdefhIklPvWZ] [-B border-lines] "
+		  "[-c start-directory] [-e environment] "
+		  "[-F format] [-l size] [-m message] [-p percentage] "
 		 "[-s style] [-S active-border-style] "
 		 "[-R inactive-border-style] [-T title] [-x width] [-y height] "
 		 "[-X x-position] [-Y y-position] " CMD_TARGET_PANE_USAGE " "
@@ -85,9 +86,11 @@ cmd_split_window_exec(struct cmd *self, struct cmdq_item *item)
 	struct layout_cell	*lc = NULL;
 	struct cmd_find_state	 fs;
 	int			 input, empty, is_floating, flags = 0;
-	const char		*template, *style;
+	const char		*template, *style, *value;
 	char			*cause = NULL, *cp, *title;
+	struct options_entry	*oe;
 	struct args_value	*av;
+	enum pane_lines		 lines;
 	u_int			 count = args_count(args);
 
 	if (cmd_get_entry(self) == &cmd_new_pane_entry)
@@ -188,6 +191,19 @@ cmd_split_window_exec(struct cmd *self, struct cmdq_item *item)
 			return (CMD_RETURN_ERROR);
 		}
 	}
+	value = args_get(args, 'B');
+	if (value != NULL) {
+		oe = options_get(new_wp->options, "pane-border-lines");
+		lines = options_find_choice(options_table_entry(oe), value,
+		    &cause);
+		if (cause != NULL) {
+			cmdq_error(item, "pane-border-lines %s", cause);
+			free(cause);
+			return (CMD_RETURN_ERROR);
+		}
+		options_set_number(new_wp->options, "pane-border-lines",
+		    lines);
+	}
 	if (args_has(args, 'k') || args_has(args, 'm')) {
 		options_set_number(new_wp->options, "remain-on-exit", 3);
 		if (args_has(args, 'm')) {
diff --git a/options-table.c b/options-table.c
index d24b90b3..92b0519b 100644
--- a/options-table.c
+++ b/options-table.c
@@ -1365,7 +1365,7 @@ const struct options_table_entry options_table[] = {
 
 	{ .name = "pane-border-lines",
 	  .type = OPTIONS_TABLE_CHOICE,
-	  .scope = OPTIONS_TABLE_WINDOW,
+	  .scope = OPTIONS_TABLE_WINDOW|OPTIONS_TABLE_PANE,
 	  .choices = options_table_pane_border_lines_list,
 	  .default_num = PANE_LINES_SINGLE,
 	  .text = "Type of characters used to draw pane border lines. Some of "
diff --git a/screen-redraw.c b/screen-redraw.c
index 3f04e74c..ce98dd99 100644
--- a/screen-redraw.c
+++ b/screen-redraw.c
@@ -1003,6 +1003,7 @@ screen_redraw_draw_borders_cell(struct screen_redraw_ctx *ctx, u_int i, u_int j)
 	struct format_tree	*ft;
 	struct window_pane	*wp, *active = server_client_get_pane(c);
 	struct grid_cell	 gc;
+	enum pane_lines		 pane_lines;
 	u_int			 cell_type;
 	u_int			 x = ctx->ox + i, y = ctx->oy + j;
 	int			 isolates;
@@ -1034,7 +1035,11 @@ screen_redraw_draw_borders_cell(struct screen_redraw_ctx *ctx, u_int i, u_int j)
 		    screen_redraw_check_is(ctx, x, y, marked_pane.wp))
 			gc.attr ^= GRID_ATTR_REVERSE;
 	}
-	screen_redraw_border_set(w, wp, ctx->pane_lines, cell_type, &gc);
+	if (wp == NULL)
+		pane_lines = ctx->pane_lines;
+	else
+		pane_lines = window_pane_get_pane_lines(wp);
+	screen_redraw_border_set(w, wp, pane_lines, cell_type, &gc);
 
 	if (cell_type == CELL_TOPBOTTOM &&
 	    (c->flags & CLIENT_UTF8) &&
diff --git a/tmux.1 b/tmux.1
index 40f74d95..59ed8c75 100644
--- a/tmux.1
+++ b/tmux.1
@@ -3490,6 +3490,7 @@ but a different format may be specified with
 .Tg newp
 .It Xo Ic new\-pane
 .Op Fl bdefhIkPvWZ
+.Op Fl B Ar border\-lines
 .Op Fl c Ar start\-directory
 .Op Fl e Ar environment
 .Op Fl F Ar format
@@ -3521,6 +3522,9 @@ sets the border style when the pane is inactive (see
 .Sx STYLES ) .
 .Fl T
 sets the pane title.
+.Fl B
+sets the pane border lines for floating panes; see
+.Ic pane\-border\-lines .
 .Pp
 .Fl h
 does a horizontal split and
diff --git a/tmux.h b/tmux.h
index 11590bc1..b70fdf06 100644
--- a/tmux.h
+++ b/tmux.h
@@ -3474,6 +3474,7 @@ int		 window_pane_get_bg_control_client(struct window_pane *);
 int		 window_get_bg_client(struct window_pane *);
 enum client_theme window_pane_get_theme(struct window_pane *);
 void		 window_pane_send_theme_update(struct window_pane *);
+enum pane_lines	 window_pane_get_pane_lines(struct window_pane *);
 int		 window_get_pane_status(struct window *);
 int		 window_pane_get_pane_status(struct window_pane *);
 struct style_range *window_pane_status_get_range(struct window_pane *, u_int,
diff --git a/window.c b/window.c
index 4ab5ca32..b3a0a0ea 100644
--- a/window.c
+++ b/window.c
@@ -2148,6 +2148,18 @@ window_pane_status_get_range(struct window_pane *wp, u_int x, u_int y)
 	return (style_ranges_get_range(srs, x - wp->xoff - 2));
 }
 
+enum pane_lines
+window_pane_get_pane_lines(struct window_pane *wp)
+{
+	struct options	*oo;
+
+	if (!window_pane_is_floating(wp))
+		oo = wp->window->options;
+	else
+		oo = wp->options;
+	return (options_get_number(oo, "pane-border-lines"));
+}
+
 int
 window_get_pane_status(struct window *w)
 {

From 8ced9c332c659bfd94e6e2a48bd875579e1bb27c Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 15 Jun 2026 11:45:51 +0000
Subject: [PATCH 4/8] Use correct x position when drawing clipped line.

---
 tty.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tty.c b/tty.c
index bb7c0ae8..5b66e2d1 100644
--- a/tty.c
+++ b/tty.c
@@ -1444,7 +1444,7 @@ tty_cmd_redrawline(struct tty *tty, const struct tty_ctx *ctx)
 			rr = &r->ranges[j];
 			if (rr->nx == 0)
 				continue;
-			tty_draw_line(tty, ctx->s, i + rr->px - x,
+			tty_draw_line(tty, ctx->s, ctx->ocx + i + rr->px - x,
 			    ctx->ocy, rr->nx, rr->px, ry, &ctx->style_ctx);
 		}
 	}

From 057b688fc709576901f18c097b1275c54a9d762e Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 15 Jun 2026 12:07:49 +0000
Subject: [PATCH 5/8] Tidy up screen_redraw_get_visible_ranges by using a
 couple of temporaries for start and end of range.

---
 screen-redraw.c | 38 ++++++++++++++++----------------------
 1 file changed, 16 insertions(+), 22 deletions(-)

diff --git a/screen-redraw.c b/screen-redraw.c
index ce98dd99..6d151087 100644
--- a/screen-redraw.c
+++ b/screen-redraw.c
@@ -1154,7 +1154,7 @@ screen_redraw_get_visible_ranges(struct window_pane *base_wp, int px,
 	struct visible_range		*ri;
 	static struct visible_ranges	 sr = { NULL, 0, 0 };
 	int				 found_self, sb, sb_w, sb_pos;
-	u_int				 lb, rb, tb, bb;
+	int				 lb, rb, tb, bb, sx, ex;
 	u_int				 i, s;
 
 	if (py < 0 || width == 0)
@@ -1207,11 +1207,10 @@ screen_redraw_get_visible_ranges(struct window_pane *base_wp, int px,
 		bb = wp->yoff + wp->sy;
 		if (!found_self ||
 		    !window_pane_visible(wp) ||
-		    (u_int)py < tb ||
-		    (u_int)py > bb)
+		    py < tb ||
+		    py > bb)
 			continue;
-		if (!window_pane_is_floating(wp) &&
-		    ((u_int)py == tb || (u_int)py == bb))
+		if (!window_pane_is_floating(wp) && (py == tb || py == bb))
 			continue;
 
 		sb_w = wp->scrollbar_style.width + wp->scrollbar_style.pad;
@@ -1235,34 +1234,29 @@ screen_redraw_get_visible_ranges(struct window_pane *base_wp, int px,
 				rb = wp->xoff + wp->sx;
 			else /* PANE_SCROLLBARS_RIGHT or none. */
 				rb = wp->xoff + wp->sx + sb_w;
-			if (rb > w->sx)
+			if (rb > (int)w->sx)
 				rb = w->sx - 1;
 
-			if (lb > ri->px &&
-			    lb < ri->px + ri->nx &&
-			    rb >= ri->px + ri->nx)
-			{
+			sx = ri->px;
+			ex = sx + ri->nx - 1;
+			if (lb > sx && lb <= ex && rb > ex) {
 				/*
 				 * If the left edge of floating pane falls
 				 * inside this range and right edge covers up
 				 * to right of range, then shrink left edge of
 				 * range.
 				 */
-				ri->nx = lb - ri->px;
-			}
-			else if (rb >= ri->px &&
-			    rb < ri->px + ri->nx &&
-			    lb <= ri->px) {
+				ri->nx = lb - sx;
+			} else if (rb >= sx && rb <= ex && lb <= sx) {
 				/*
 				 * Else if the right edge of floating pane falls
 				 * inside of this range and left edge covers
 				 * the left of range, then move px forward to
 				 * right edge of pane.
 				 */
-				ri->nx = ri->nx - (rb + 1 - ri->px);
-				ri->px = ri->px + (rb + 1 - ri->px);
-			}
-			else if (lb > ri->px && rb < ri->px + ri->nx) {
+				ri->nx = ex - rb;
+				ri->px = rb + 1;
+			} else if (lb > sx && rb <= ex) {
 				/*
 				 * Else if pane fully inside range then split
 				 * into 2 ranges.
@@ -1274,11 +1268,11 @@ screen_redraw_get_visible_ranges(struct window_pane *base_wp, int px,
 				}
 				ri = &r->ranges[i];
 				r->ranges[i + 1].px = rb + 1;
-				r->ranges[i + 1].nx = ri->px + ri->nx - (rb + 1);
+				r->ranges[i + 1].nx = ex - rb;
 				/* ri->px was copied, unchanged. */
-				ri->nx = lb - ri->px;
+				ri->nx = lb - sx;
 				r->used++;
-			} else if (lb <= ri->px && rb >= ri->px + ri->nx) {
+			} else if (lb <= sx && rb > ex) {
 				/*
 				 * If floating pane completely covers this range
 				 * then delete it (make it 0 length).

From 0e6fe5a09786faf4c79b67c6eb48425c47e9c018 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 15 Jun 2026 14:56:30 +0000
Subject: [PATCH 6/8] Convert cursor position back to pane coordinates for
 tty_cmd_cell.

---
 screen-write.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/screen-write.c b/screen-write.c
index fbef8320..ff1a713f 100644
--- a/screen-write.c
+++ b/screen-write.c
@@ -2587,7 +2587,7 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
 		if (ri->nx == 0)
 			continue;
 		for (n = 0; n < ri->nx; n++) {
-			ttyctx.ocx = ri->px + n;
+			ttyctx.ocx = (int)ri->px - xoff + (int)n;
 			tty_write(tty_cmd_cell, &ttyctx);
 		}
 	}

From bb750b07bc0804f822357ec3ced7a258c0119890 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 15 Jun 2026 15:05:12 +0000
Subject: [PATCH 7/8] If the client is blocked, defer the redraw because it may
 end up partially discarded leading to redraw artifacts.

---
 server-client.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/server-client.c b/server-client.c
index 35a505b1..a40c348b 100644
--- a/server-client.c
+++ b/server-client.c
@@ -2051,8 +2051,13 @@ server_client_check_redraw(struct client *c)
 			}
 		}
 	}
-	if (needed && (left = EVBUFFER_LENGTH(tty->out)) != 0) {
-		log_debug("%s: redraw deferred (%zu left)", c->name, left);
+	left = EVBUFFER_LENGTH(tty->out);
+	if (needed && (left != 0 || (tty->flags & TTY_BLOCK))) {
+		if (left != 0) {
+			log_debug("%s: redraw deferred (%zu left)", c->name,
+			    left);
+		} else
+			log_debug("%s: redraw deferred (blocked)", c->name);
 		if (!evtimer_initialized(&ev))
 			evtimer_set(&ev, server_client_redraw_timer, NULL);
 		if (!evtimer_pending(&ev, NULL)) {

From b86bd1fcd0e0defa36e83ad37acf9eafb5d55459 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 15 Jun 2026 17:34:25 +0000
Subject: [PATCH 8/8] Add pane-border-lines none like popups (-B to new-pane).

---
 cmd-join-pane.c | 28 ++++++++++++++++------------
 layout.c        |  3 ++-
 options-table.c |  2 +-
 screen-redraw.c | 44 +++++++++++++++++++++++++++++++++++---------
 server-client.c |  7 +++++++
 tmux.1          |  2 ++
 tmux.h          |  3 ++-
 window.c        | 19 ++++++++++++++-----
 8 files changed, 79 insertions(+), 29 deletions(-)

diff --git a/cmd-join-pane.c b/cmd-join-pane.c
index 857aac0e..30f491f6 100644
--- a/cmd-join-pane.c
+++ b/cmd-join-pane.c
@@ -71,20 +71,24 @@ cmd_join_pane_place(struct cmdq_item *item, struct winlink *wl,
 	struct window_pane	*owp;
 	int			 wx = w->sx, wy = w->sy, px = lc->sx;
 	int			 py = lc->sy, xoff = lc->xoff, yoff = lc->yoff;
+	int			 border = 1;
+
+	if (window_pane_get_pane_lines(wp) == PANE_LINES_NONE)
+		border = 0;
 
 	if (strcmp(position, "top-left") == 0) {
-		xoff = 1;
-		yoff = 1;
+		xoff = border;
+		yoff = border;
 	} else if (strcmp(position, "top-centre") == 0 ||
 	    strcmp(position, "top-center") == 0) {
 		xoff = (wx - px) / 2;
-		yoff = 1;
+		yoff = border;
 	} else if (strcmp(position, "top-right") == 0) {
-		xoff = wx - px - 1;
-		yoff = 1;
+		xoff = wx - px - border;
+		yoff = border;
 	} else if (strcmp(position, "centre-left") == 0 ||
 	    strcmp(position, "center-left") == 0) {
-		xoff = 1;
+		xoff = border;
 		yoff = (wy - py) / 2;
 	} else if (strcmp(position, "centre") == 0 ||
 	    strcmp(position, "center") == 0) {
@@ -92,18 +96,18 @@ cmd_join_pane_place(struct cmdq_item *item, struct winlink *wl,
 		yoff = (wy - py) / 2;
 	} else if (strcmp(position, "centre-right") == 0 ||
 	    strcmp(position, "center-right") == 0) {
-		xoff = wx - px - 1;
+		xoff = wx - px - border;
 		yoff = (wy - py) / 2;
 	} else if (strcmp(position, "bottom-left") == 0) {
-		xoff = 1;
-		yoff = wy - py - 1;
+		xoff = border;
+		yoff = wy - py - border;
 	} else if (strcmp(position, "bottom-centre") == 0 ||
 	    strcmp(position, "bottom-center") == 0) {
 		xoff = (wx - px) / 2;
-		yoff = wy - py - 1;
+		yoff = wy - py - border;
 	} else if (strcmp(position, "bottom-right") == 0) {
-		xoff = wx - px - 1;
-		yoff = wy - py - 1;
+		xoff = wx - px - border;
+		yoff = wy - py - border;
 	} else if (strcmp(position, "top-left-centre") == 0 ||
 	    strcmp(position, "top-left-center") == 0) {
 		xoff = wx / 4 - px / 2;
diff --git a/layout.c b/layout.c
index 686d1bdf..0e8a2a2a 100644
--- a/layout.c
+++ b/layout.c
@@ -712,7 +712,8 @@ layout_resize_floating_pane_to(struct window_pane *wp, enum layout_type type,
 		return;
 	}
 
-	if (size >= PANE_MINIMUM + 2)
+	if (window_pane_get_pane_lines(wp) != PANE_LINES_NONE &&
+	    size >= PANE_MINIMUM + 2)
 		size -= 2;
 	if (size < PANE_MINIMUM || size > PANE_MAXIMUM) {
 		*cause = xstrdup("size is too big or too small");
diff --git a/options-table.c b/options-table.c
index 92b0519b..ed90bd92 100644
--- a/options-table.c
+++ b/options-table.c
@@ -77,7 +77,7 @@ static const char *options_table_pane_border_indicators_list[] = {
 	"off", "colour", "arrows", "both", NULL
 };
 static const char *options_table_pane_border_lines_list[] = {
-	"single", "double", "heavy", "simple", "number", "spaces", NULL
+	"single", "double", "heavy", "simple", "number", "spaces", "none", NULL
 };
 static const char *options_table_popup_border_lines_list[] = {
 	"single", "double", "heavy", "simple", "rounded", "padded", "none", NULL
diff --git a/screen-redraw.c b/screen-redraw.c
index 6d151087..b2bfb824 100644
--- a/screen-redraw.c
+++ b/screen-redraw.c
@@ -87,6 +87,7 @@ screen_redraw_border_set(struct window *w, struct window_pane *wp,
 		gc->attr &= ~GRID_ATTR_CHARSET;
 		utf8_set(&gc->data, SIMPLE_BORDERS[cell_type]);
 		break;
+	case PANE_LINES_NONE:
 	case PANE_LINES_SPACES:
 		gc->attr &= ~GRID_ATTR_CHARSET;
 		utf8_set(&gc->data, ' ');
@@ -140,6 +141,10 @@ screen_redraw_pane_border(struct screen_redraw_ctx *ctx, struct window_pane *wp,
 	if (px >= wp->xoff && px < ex && py >= wp->yoff && py < ey)
 		return (SCREEN_REDRAW_INSIDE);
 
+	if (window_pane_is_floating(wp) &&
+	    window_pane_get_pane_lines(wp) == PANE_LINES_NONE)
+		return (SCREEN_REDRAW_OUTSIDE);
+
 	/* Are scrollbars enabled? */
 	if (window_pane_show_scrollbar(wp, pane_scrollbars))
 		sb_w = wp->scrollbar_style.width + wp->scrollbar_style.pad;
@@ -1153,7 +1158,7 @@ screen_redraw_get_visible_ranges(struct window_pane *base_wp, int px,
 	struct window			*w;
 	struct visible_range		*ri;
 	static struct visible_ranges	 sr = { NULL, 0, 0 };
-	int				 found_self, sb, sb_w, sb_pos;
+	int				 found_self, sb, sb_w, sb_pos, no_border;
 	int				 lb, rb, tb, bb, sx, ex;
 	u_int				 i, s;
 
@@ -1203,8 +1208,18 @@ screen_redraw_get_visible_ranges(struct window_pane *base_wp, int px,
 			continue;
 		}
 
-		tb = wp->yoff > 0 ? wp->yoff - 1 : 0;
-		bb = wp->yoff + wp->sy;
+		if (window_pane_is_floating(wp) &&
+		    window_pane_get_pane_lines(wp) == PANE_LINES_NONE)
+			no_border = 1;
+		else
+			no_border = 0;
+		if (no_border) {
+			tb = wp->yoff;
+			bb = wp->yoff + (int)wp->sy - 1;
+		} else {
+			tb = wp->yoff > 0 ? wp->yoff - 1 : 0;
+			bb = wp->yoff + (int)wp->sy;
+		}
 		if (!found_self ||
 		    !window_pane_visible(wp) ||
 		    py < tb ||
@@ -1219,7 +1234,10 @@ screen_redraw_get_visible_ranges(struct window_pane *base_wp, int px,
 
 		for (i = 0; i < r->used; i++) {
 			ri = &r->ranges[i];
-			if (sb_pos == PANE_SCROLLBARS_LEFT) {
+			if (no_border) {
+				lb = wp->xoff;
+				rb = wp->xoff + (int)wp->sx - 1;
+			} else if (sb_pos == PANE_SCROLLBARS_LEFT) {
 				if (wp->xoff > sb_w)
 					lb = wp->xoff - 1 - sb_w;
 				else
@@ -1230,11 +1248,19 @@ screen_redraw_get_visible_ranges(struct window_pane *base_wp, int px,
 				else
 					lb = 0;
 			}
-			if (sb_pos == PANE_SCROLLBARS_LEFT)
-				rb = wp->xoff + wp->sx;
-			else /* PANE_SCROLLBARS_RIGHT or none. */
-				rb = wp->xoff + wp->sx + sb_w;
-			if (rb > (int)w->sx)
+			if (!no_border) {
+				if (sb_pos == PANE_SCROLLBARS_LEFT)
+					rb = wp->xoff + (int)wp->sx;
+				else /* PANE_SCROLLBARS_RIGHT or none. */
+					rb = wp->xoff + (int)wp->sx + sb_w;
+			}
+			if (lb < 0)
+				lb = 0;
+			if (rb < 0)
+				continue;
+			if (no_border && rb >= (int)w->sx)
+				rb = w->sx - 1;
+			else if (!no_border && rb > (int)w->sx)
 				rb = w->sx - 1;
 
 			sx = ri->px;
diff --git a/server-client.c b/server-client.c
index a40c348b..2bb031bd 100644
--- a/server-client.c
+++ b/server-client.c
@@ -602,6 +602,7 @@ server_client_exec(struct client *c, const char *cmd)
 	free(msg);
 }
 
+/* Is the mouse inside a pane? */
 static enum key_code_mouse_location
 server_client_check_mouse_in_pane(struct window_pane *wp, int px, int py,
     u_int *sl_mpos)
@@ -659,6 +660,7 @@ server_client_check_mouse_in_pane(struct window_pane *wp, int px, int py,
 			} else /* py > sl_bottom */
 				return (KEYC_MOUSE_LOCATION_SCROLLBAR_DOWN);
 		} else if (window_pane_is_floating(wp) &&
+		    window_pane_get_pane_lines(wp) != PANE_LINES_NONE &&
 		    (px == wp->xoff - 1 ||
 		    py == wp->yoff - 1 ||
 		    py == wp->yoff + (int)wp->sy)) {
@@ -674,6 +676,9 @@ server_client_check_mouse_in_pane(struct window_pane *wp, int px, int py,
 			if ((w->flags & WINDOW_ZOOMED) &&
 			    (~fwp->flags & PANE_ZOOMED))
 				continue;
+			if (window_pane_is_floating(fwp) &&
+			    window_pane_get_pane_lines(fwp) == PANE_LINES_NONE)
+				continue;
 			bdr_top = fwp->yoff - 1;
 			bdr_bottom = fwp->yoff + fwp->sy;
 			if (sb_pos == PANE_SCROLLBARS_LEFT)
@@ -1510,12 +1515,14 @@ server_client_handle_key0(struct client *c, struct key_event *event,
 	return (1);
 }
 
+/* Handle key and insert at end of queue. */
 int
 server_client_handle_key(struct client *c, struct key_event *event)
 {
 	return (server_client_handle_key0(c, event, NULL, NULL));
 }
 
+/* Handle key and insert after another item. */
 int
 server_client_handle_key_after(struct client *c, struct key_event *event,
     struct cmdq_item *after, struct cmdq_item **next)
diff --git a/tmux.1 b/tmux.1
index 59ed8c75..2f092030 100644
--- a/tmux.1
+++ b/tmux.1
@@ -5634,6 +5634,8 @@ simple ASCII characters
 the pane number
 .It spaces
 space characters
+.It none
+no border for floating panes
 .El
 .Pp
 .Ql double
diff --git a/tmux.h b/tmux.h
index b70fdf06..261b9962 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1057,7 +1057,8 @@ enum pane_lines {
 	PANE_LINES_HEAVY,
 	PANE_LINES_SIMPLE,
 	PANE_LINES_NUMBER,
-	PANE_LINES_SPACES
+	PANE_LINES_SPACES,
+	PANE_LINES_NONE
 };
 
 /* Pane border indicator option. */
diff --git a/window.c b/window.c
index b3a0a0ea..0187737a 100644
--- a/window.c
+++ b/window.c
@@ -667,11 +667,18 @@ window_get_active_at(struct window *w, u_int x, u_int y)
 					continue;
 			}
 		} else {
-			/* Floating - include all borders. */
-			if ((int)x < xoff - 1 || x > xoff + sx)
-				continue;
-			if ((int)y < yoff - 1 || y > yoff + sy)
-				continue;
+			if (window_pane_get_pane_lines(wp) == PANE_LINES_NONE) {
+				if ((int)x < xoff || (int)x >= xoff + (int)sx)
+					continue;
+				if ((int)y < yoff || (int)y >= yoff + (int)sy)
+					continue;
+			} else {
+				/* Floating - include all borders. */
+				if ((int)x < xoff - 1 || x > xoff + sx)
+					continue;
+				if ((int)y < yoff - 1 || y > yoff + sy)
+					continue;
+			}
 		}
 		return (wp);
 	}
@@ -2179,6 +2186,8 @@ window_pane_get_pane_status(struct window_pane *wp)
 
 	if (!window_pane_is_floating(wp))
 		return (window_get_pane_status(wp->window));
+	if (window_pane_get_pane_lines(wp) == PANE_LINES_NONE)
+		return (PANE_STATUS_OFF);
 
 	status = options_get_number(wp->options, "pane-border-status");
 	if (status == PANE_STATUS_TOP_FLOATING)