From 7d59f82cf96a91ac560d06aef0fe5c8880cf2244 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Tue, 25 Sep 2018 14:27:20 +0000
Subject: [PATCH] Allow panes to be 1 line or column by redrawing instead of
 using the scroll region, from Soeren Tempel in GitHub issue 1487.

---
 tmux.h        |  7 ++-----
 tty.c         | 20 +++++++++++++++-----
 window-copy.c |  2 +-
 3 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/tmux.h b/tmux.h
index e95febf8..4e070249 100644
--- a/tmux.h
+++ b/tmux.h
@@ -59,11 +59,8 @@ struct tmuxproc;
 /* Default global configuration file. */
 #define TMUX_CONF "/etc/tmux.conf"
 
-/*
- * Minimum layout cell size, NOT including separator line. The scroll region
- * cannot be one line in height so this must be at least two.
- */
-#define PANE_MINIMUM 2
+/* Minimum layout cell size, NOT including border lines. */
+#define PANE_MINIMUM 1
 
 /* Automatic name refresh interval, in microseconds. Must be < 1 second. */
 #define NAME_INTERVAL 500000
diff --git a/tty.c b/tty.c
index b6dd3403..5bf4a3ca 100644
--- a/tty.c
+++ b/tty.c
@@ -1145,7 +1145,9 @@ tty_cmd_insertline(struct tty *tty, const struct tty_ctx *ctx)
 	if (!tty_pane_full_width(tty, ctx) ||
 	    tty_fake_bce(tty, ctx->wp, ctx->bg) ||
 	    !tty_term_has(tty->term, TTYC_CSR) ||
-	    !tty_term_has(tty->term, TTYC_IL1)) {
+	    !tty_term_has(tty->term, TTYC_IL1) ||
+	    ctx->wp->sx == 1 ||
+	    ctx->wp->sy == 1) {
 		tty_redraw_region(tty, ctx);
 		return;
 	}
@@ -1166,7 +1168,9 @@ tty_cmd_deleteline(struct tty *tty, const struct tty_ctx *ctx)
 	if (!tty_pane_full_width(tty, ctx) ||
 	    tty_fake_bce(tty, ctx->wp, ctx->bg) ||
 	    !tty_term_has(tty->term, TTYC_CSR) ||
-	    !tty_term_has(tty->term, TTYC_DL1)) {
+	    !tty_term_has(tty->term, TTYC_DL1) ||
+	    ctx->wp->sx == 1 ||
+	    ctx->wp->sy == 1) {
 		tty_redraw_region(tty, ctx);
 		return;
 	}
@@ -1227,7 +1231,9 @@ tty_cmd_reverseindex(struct tty *tty, const struct tty_ctx *ctx)
 	if (!tty_pane_full_width(tty, ctx) ||
 	    tty_fake_bce(tty, wp, 8) ||
 	    !tty_term_has(tty->term, TTYC_CSR) ||
-	    !tty_term_has(tty->term, TTYC_RI)) {
+	    !tty_term_has(tty->term, TTYC_RI) ||
+	    ctx->wp->sx == 1 ||
+	    ctx->wp->sy == 1) {
 		tty_redraw_region(tty, ctx);
 		return;
 	}
@@ -1251,7 +1257,9 @@ tty_cmd_linefeed(struct tty *tty, const struct tty_ctx *ctx)
 
 	if ((!tty_pane_full_width(tty, ctx) && !tty_use_margin(tty)) ||
 	    tty_fake_bce(tty, wp, 8) ||
-	    !tty_term_has(tty->term, TTYC_CSR)) {
+	    !tty_term_has(tty->term, TTYC_CSR) ||
+	    wp->sx == 1 ||
+	    wp->sy == 1) {
 		tty_redraw_region(tty, ctx);
 		return;
 	}
@@ -1287,7 +1295,9 @@ tty_cmd_scrollup(struct tty *tty, const struct tty_ctx *ctx)
 
 	if ((!tty_pane_full_width(tty, ctx) && !tty_use_margin(tty)) ||
 	    tty_fake_bce(tty, wp, 8) ||
-	    !tty_term_has(tty->term, TTYC_CSR)) {
+	    !tty_term_has(tty->term, TTYC_CSR) ||
+	    wp->sx == 1 ||
+	    wp->sy == 1) {
 		tty_redraw_region(tty, ctx);
 		return;
 	}
diff --git a/window-copy.c b/window-copy.c
index 383f2c4e..78667b1e 100644
--- a/window-copy.c
+++ b/window-copy.c
@@ -1299,7 +1299,7 @@ window_copy_write_line(struct window_pane *wp, struct screen_write_ctx *ctx,
 	style_apply(&gc, oo, "mode-style");
 	gc.flags |= GRID_FLAG_NOPALETTE;
 
-	if (py == 0) {
+	if (py == 0 && s->rupper < s->rlower) {
 		if (data->searchmark == NULL) {
 			size = xsnprintf(hdr, sizeof hdr,
 			    "[%u/%u]", data->oy, screen_hsize(data->backing));