From e8224fb0d123ca9042b0703a35e1a33f0787d327 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Fri, 12 Mar 2021 08:39:17 +0000
Subject: Fix so tmux correctly sends the cvvis (cursor very visible)
 capability rather than sending it and then immediately undoing it with cnorm.
 Also turn it off when the cursor shape is changed like xterm.

---
 tty.c | 38 +++++++++++++++++++++++++-------------
 1 file changed, 25 insertions(+), 13 deletions(-)

(limited to 'tty.c')

diff --git a/tty.c b/tty.c
index 399bbae8..e8a8cbaa 100644
--- a/tty.c
+++ b/tty.c
@@ -670,19 +670,10 @@ tty_update_mode(struct tty *tty, int mode, struct screen *s)
 	if (changed != 0)
 		log_debug("%s: update mode %x to %x", c->name, tty->mode, mode);
 
-	if (changed & MODE_BLINKING) {
-		if (tty_term_has(tty->term, TTYC_CVVIS))
-			tty_putcode(tty, TTYC_CVVIS);
-		else
-			tty_putcode(tty, TTYC_CNORM);
-		changed |= MODE_CURSOR;
-	}
-	if (changed & MODE_CURSOR) {
-		if (mode & MODE_CURSOR)
-			tty_putcode(tty, TTYC_CNORM);
-		else
-			tty_putcode(tty, TTYC_CIVIS);
-	}
+	/*
+	 * The cursor blinking flag can be reset by setting the cursor style, so
+	 * set the style first.
+	 */
 	if (s != NULL && tty->cstyle != s->cstyle) {
 		if (tty_term_has(tty->term, TTYC_SS)) {
 			if (s->cstyle == 0 && tty_term_has(tty->term, TTYC_SE))
@@ -691,7 +682,28 @@ tty_update_mode(struct tty *tty, int mode, struct screen *s)
 				tty_putcode1(tty, TTYC_SS, s->cstyle);
 		}
 		tty->cstyle = s->cstyle;
+		changed |= (MODE_CURSOR|MODE_BLINKING);
 	}
+
+	/*
+	 * Cursor invisible (RM ?25) overrides cursor blinking (SM ?12 or RM
+	 * 34), and we need to be careful not send cnorm after cvvis since it
+	 * can undo it.
+	 */
+	if (changed & (MODE_CURSOR|MODE_BLINKING)) {
+		log_debug("%s: cursor %s, %sblinking", __func__,
+		    (mode & MODE_CURSOR) ? "on" : "off",
+		    (mode & MODE_BLINKING) ? "" : "not ");
+		if (~mode & MODE_CURSOR)
+			tty_putcode(tty, TTYC_CIVIS);
+		else if (mode & MODE_BLINKING) {
+			tty_putcode(tty, TTYC_CNORM);
+			if (tty_term_has(tty->term, TTYC_CVVIS))
+				tty_putcode(tty, TTYC_CVVIS);
+		} else
+			tty_putcode(tty, TTYC_CNORM);
+	}
+
 	if ((changed & ALL_MOUSE_MODES) &&
 	    tty_term_has(tty->term, TTYC_KMOUS)) {
 		/*
-- 
cgit