diff --git a/cmd-new-window.c b/cmd-new-window.c
index ca3e66c4..712e2a79 100644
--- a/cmd-new-window.c
+++ b/cmd-new-window.c
@@ -38,8 +38,8 @@ const struct cmd_entry cmd_new_window_entry = {
 	.name = "new-window",
 	.alias = "neww",
 
-	.args = { "abc:de:F:kn:Pt:", 0, -1 },
-	.usage = "[-abdkP] [-c start-directory] [-e environment] [-F format] "
+	.args = { "abc:de:F:kn:PSt:", 0, -1 },
+	.usage = "[-abdkPS] [-c start-directory] [-e environment] [-F format] "
 		 "[-n window-name] " CMD_TARGET_WINDOW_USAGE " [command]",
 
 	.target = { 't', CMD_FIND_WINDOW, CMD_FIND_WINDOW_INDEX },
@@ -52,6 +52,7 @@ static enum cmd_retval
 cmd_new_window_exec(struct cmd *self, struct cmdq_item *item)
 {
 	struct args		*args = cmd_get_args(self);
+	struct client		*c = cmdq_get_client(item);
 	struct cmd_find_state	*current = cmdq_get_current(item);
 	struct cmd_find_state	*target = cmdq_get_target(item);
 	struct spawn_context	 sc;
@@ -59,12 +60,41 @@ cmd_new_window_exec(struct cmd *self, struct cmdq_item *item)
 	struct session		*s = target->s;
 	struct winlink		*wl = target->wl;
 	int			 idx = target->idx, before;
-	struct winlink		*new_wl;
+	struct winlink		*new_wl = NULL;
 	char			*cause = NULL, *cp;
-	const char		*template, *add;
+	const char		*template, *add, *name;
 	struct cmd_find_state	 fs;
 	struct args_value	*value;
 
+	/*
+	 * If -S and -n are given and -t is not and a single window with this
+	 * name already exists, select it.
+	 */
+	name = args_get(args, 'n');
+	if (args_has(args, 'S') && name != NULL && target->idx == -1) {
+		RB_FOREACH(wl, winlinks, &s->windows) {
+			if (strcmp(wl->window->name, name) != 0)
+				continue;
+			if (new_wl == NULL) {
+				new_wl = wl;
+				continue;
+			}
+			cmdq_error(item, "multiple windows named %s", name);
+			return (CMD_RETURN_ERROR);
+		}
+		if (new_wl != NULL) {
+			if (args_has(args, 'd'))
+				return (CMD_RETURN_NORMAL);
+			if (session_set_current(s, new_wl) == 0)
+				server_redraw_session(s);
+			if (c != NULL && c->session != NULL)
+				s->curw->window->latest = c;
+			recalculate_sizes();
+			return (CMD_RETURN_NORMAL);
+		}
+	}
+
+
 	before = args_has(args, 'b');
 	if (args_has(args, 'a') || before) {
 		idx = winlink_shuffle_up(s, wl, before);
diff --git a/format.c b/format.c
index c2b9df21..de11fc8b 100644
--- a/format.c
+++ b/format.c
@@ -100,6 +100,8 @@ format_job_cmp(struct format_job *fj1, struct format_job *fj2)
 #define FORMAT_LENGTH 0x800
 #define FORMAT_WIDTH 0x1000
 #define FORMAT_QUOTE_STYLE 0x2000
+#define FORMAT_WINDOW_NAME 0x4000
+#define FORMAT_SESSION_NAME 0x8000
 
 /* Limit on recursion. */
 #define FORMAT_LOOP_LIMIT 10
@@ -1733,7 +1735,7 @@ format_build_modifiers(struct format_expand_state *es, const char **s,
 		}
 
 		/* Now try single character with arguments. */
-		if (strchr("mCst=peq", cp[0]) == NULL)
+		if (strchr("mCNst=peq", cp[0]) == NULL)
 			break;
 		c = cp[0];
 
@@ -1857,6 +1859,24 @@ format_search(struct format_modifier *fm, struct window_pane *wp, const char *s)
 	return (value);
 }
 
+/* Does session name exist? */
+static char *
+format_session_name(struct format_expand_state *es, const char *fmt)
+{
+	char		*name;
+	struct session	*s;
+
+	name = format_expand1(es, fmt);
+	RB_FOREACH(s, sessions, &sessions) {
+		if (strcmp(s->name, name) == 0) {
+			free(name);
+			return (xstrdup("1"));
+		}
+	}
+	free(name);
+	return (xstrdup("0"));
+}
+
 /* Loop over sessions. */
 static char *
 format_loop_sessions(struct format_expand_state *es, const char *fmt)
@@ -1892,6 +1912,30 @@ format_loop_sessions(struct format_expand_state *es, const char *fmt)
 	return (value);
 }
 
+/* Does window name exist? */
+static char *
+format_window_name(struct format_expand_state *es, const char *fmt)
+{
+	struct format_tree	*ft = es->ft;
+	char			*name;
+	struct winlink		*wl;
+
+	if (ft->s == NULL) {
+		format_log(es, "window name but no session");
+		return (NULL);
+	}
+
+	name = format_expand1(es, fmt);
+	RB_FOREACH(wl, winlinks, &ft->s->windows) {
+		if (strcmp(wl->window->name, name) == 0) {
+			free(name);
+			return (xstrdup("1"));
+		}
+	}
+	free(name);
+	return (xstrdup("0"));
+}
+
 /* Loop over windows. */
 static char *
 format_loop_windows(struct format_expand_state *es, const char *fmt)
@@ -2251,6 +2295,13 @@ format_replace(struct format_expand_state *es, const char *key, size_t keylen,
 			case 'T':
 				modifiers |= FORMAT_EXPANDTIME;
 				break;
+			case 'N':
+				if (fm->argc < 1 ||
+				    strchr(fm->argv[0], 'w') != NULL)
+					modifiers |= FORMAT_WINDOW_NAME;
+				else if (strchr(fm->argv[0], 's') != NULL)
+					modifiers |= FORMAT_SESSION_NAME;
+				break;
 			case 'S':
 				modifiers |= FORMAT_SESSIONS;
 				break;
@@ -2291,6 +2342,14 @@ format_replace(struct format_expand_state *es, const char *key, size_t keylen,
 		value = format_loop_panes(es, copy);
 		if (value == NULL)
 			goto fail;
+	} else if (modifiers & FORMAT_WINDOW_NAME) {
+		value = format_window_name(es, copy);
+		if (value == NULL)
+			goto fail;
+	} else if (modifiers & FORMAT_SESSION_NAME) {
+		value = format_session_name(es, copy);
+		if (value == NULL)
+			goto fail;
 	} else if (search != NULL) {
 		/* Search in pane. */
 		new = format_expand1(es, copy);
diff --git a/grid.c b/grid.c
index 3eeb7a27..1822f2b5 100644
--- a/grid.c
+++ b/grid.c
@@ -1048,14 +1048,14 @@ grid_duplicate_lines(struct grid *dst, u_int dy, struct grid *src, u_int sy,
 			    srcl->cellsize * sizeof *dstl->celldata);
 		} else
 			dstl->celldata = NULL;
-
 		if (srcl->extdsize != 0) {
 			dstl->extdsize = srcl->extdsize;
 			dstl->extddata = xreallocarray(NULL, dstl->extdsize,
 			    sizeof *dstl->extddata);
 			memcpy(dstl->extddata, srcl->extddata, dstl->extdsize *
 			    sizeof *dstl->extddata);
-		}
+		} else
+			dstl->extddata = NULL;
 
 		sy++;
 		dy++;
diff --git a/screen-redraw.c b/screen-redraw.c
index 47c1a838..6ddabc52 100644
--- a/screen-redraw.c
+++ b/screen-redraw.c
@@ -32,8 +32,8 @@ static void	screen_redraw_set_context(struct client *,
 		    struct screen_redraw_ctx *);
 
 #define CELL_INSIDE 0
-#define CELL_LEFTRIGHT 1
-#define CELL_TOPBOTTOM 2
+#define CELL_TOPBOTTOM 1
+#define CELL_LEFTRIGHT 2
 #define CELL_TOPLEFT 3
 #define CELL_TOPRIGHT 4
 #define CELL_BOTTOMLEFT 5
@@ -47,6 +47,9 @@ static void	screen_redraw_set_context(struct client *,
 
 #define CELL_BORDERS " xqlkmjwvtun~"
 
+#define START_ISOLATE "\342\201\246"
+#define END_ISOLATE   "\342\201\251"
+
 static const struct utf8_data screen_redraw_double_borders[] = {
 	{ "", 0, 0, 0 },
 	{ "\342\225\221", 0, 3, 1 }, /* U+2551 */
@@ -299,7 +302,7 @@ screen_redraw_type_of_cell(struct client *c, u_int px, u_int py,
 	case 13:	/* 1101, left right bottom */
 		return (CELL_TOPJOIN);
 	case 12:	/* 1100, left right */
-		return (CELL_TOPBOTTOM);
+		return (CELL_LEFTRIGHT);
 	case 11:	/* 1011, left top bottom */
 		return (CELL_RIGHTJOIN);
 	case 10:	/* 1010, left top */
@@ -313,7 +316,7 @@ screen_redraw_type_of_cell(struct client *c, u_int px, u_int py,
 	case 5:		/* 0101, right bottom */
 		return (CELL_TOPLEFT);
 	case 3:		/* 0011, top bottom */
-		return (CELL_LEFTRIGHT);
+		return (CELL_TOPBOTTOM);
 	}
 	return (CELL_OUTSIDE);
 }
@@ -680,7 +683,7 @@ screen_redraw_draw_borders_cell(struct screen_redraw_ctx *ctx, u_int i, u_int j)
 	struct tty		*tty = &c->tty;
 	struct window_pane	*wp;
 	u_int			 cell_type, x = ctx->ox + i, y = ctx->oy + j;
-	int			 pane_status = ctx->pane_status;
+	int			 pane_status = ctx->pane_status, isolates;
 	struct grid_cell	 gc;
 	const struct grid_cell	*tmp;
 
@@ -705,11 +708,22 @@ screen_redraw_draw_borders_cell(struct screen_redraw_ctx *ctx, u_int i, u_int j)
 	}
 	screen_redraw_border_set(wp, ctx->pane_lines, cell_type, &gc);
 
+	if (cell_type == CELL_TOPBOTTOM &&
+	    (c->flags & CLIENT_UTF8) &&
+	    tty_term_has(tty->term, TTYC_BIDI))
+		isolates = 1;
+	else
+		isolates = 0;
+
 	if (ctx->statustop)
 		tty_cursor(tty, i, ctx->statuslines + j);
 	else
 		tty_cursor(tty, i, j);
+	if (isolates)
+		tty_puts(tty, END_ISOLATE);
 	tty_cell(tty, &gc, &grid_default_cell, NULL);
+	if (isolates)
+		tty_puts(tty, START_ISOLATE);
 }
 
 /* Draw the borders. */
diff --git a/tmux.1 b/tmux.1
index f5988c42..9f617c76 100644
--- a/tmux.1
+++ b/tmux.1
@@ -2348,7 +2348,7 @@ the
 .Ic base-index
 option.
 .It Xo Ic new-window
-.Op Fl abdkP
+.Op Fl abdkPS
 .Op Fl c Ar start-directory
 .Op Fl e Ar environment
 .Op Fl F Ar format
@@ -2377,6 +2377,14 @@ represents the window to be created; if the target already exists an error is
 shown, unless the
 .Fl k
 flag is used, in which case it is destroyed.
+If
+.Fl S
+is given and a window named
+.Ar window-name
+already exists, it is selected (unless
+.Fl d
+is also given in which case the command does nothing).
+.Pp
 .Ar shell-command
 is the command to execute.
 If
@@ -4688,6 +4696,17 @@ For example, to get a list of windows formatted like the status line:
 #{W:#{E:window-status-format} ,#{E:window-status-current-format} }
 .Ed
 .Pp
+.Ql N:\&
+checks if a window (without any suffix or with the
+.Ql w
+suffix) or a session (with the
+.Ql s
+suffix) name exists, for example
+.Ql `N/w:foo`
+is replaced with 1 if a window named
+.Ql foo
+exists.
+.Pp
 A prefix of the form
 .Ql s/foo/bar/:\&
 will substitute
@@ -5934,6 +5953,10 @@ option should be used.
 An existing extension that tells
 .Nm
 the terminal supports default colours.
+.It Em \&Bidi
+Tell
+.Nm
+that the terminal supports the VTE bidirectional text extensions.
 .It Em \&Cs , Cr
 Set the cursor colour.
 The first takes a single string argument and is used to set the colour;
diff --git a/tmux.h b/tmux.h
index 885492f7..3c496ae0 100644
--- a/tmux.h
+++ b/tmux.h
@@ -262,6 +262,7 @@ enum tty_code_code {
 	TTYC_AX,
 	TTYC_BCE,
 	TTYC_BEL,
+	TTYC_BIDI,
 	TTYC_BLINK,
 	TTYC_BOLD,
 	TTYC_CIVIS,
diff --git a/tty-term.c b/tty-term.c
index ec8302a6..ad6a5567 100644
--- a/tty-term.c
+++ b/tty-term.c
@@ -61,6 +61,7 @@ static const struct tty_term_code_entry tty_term_codes[] = {
 	[TTYC_AX] = { TTYCODE_FLAG, "AX" },
 	[TTYC_BCE] = { TTYCODE_FLAG, "bce" },
 	[TTYC_BEL] = { TTYCODE_STRING, "bel" },
+	[TTYC_BIDI] = { TTYCODE_STRING, "Bidi" },
 	[TTYC_BLINK] = { TTYCODE_STRING, "blink" },
 	[TTYC_BOLD] = { TTYCODE_STRING, "bold" },
 	[TTYC_CIVIS] = { TTYCODE_STRING, "civis" },