From 4ed8306b02499dbc0cf1be1899b726b0b0202be5 Mon Sep 17 00:00:00 2001
From: Maciej Bartczak <39600846+maciekbartczak@users.noreply.github.com>
Date: Sat, 28 Dec 2024 17:18:15 +0100
Subject: [PATCH 1/2] Add delay before updating the title

---
 src/apprt/gtk/Surface.zig | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/apprt/gtk/Surface.zig b/src/apprt/gtk/Surface.zig
index 3d80d92595..115b7e13bf 100644
--- a/src/apprt/gtk/Surface.zig
+++ b/src/apprt/gtk/Surface.zig
@@ -346,6 +346,9 @@ cursor: ?*c.GdkCursor = null,
 /// pass it to GTK.
 title_text: ?[:0]const u8 = null,
 
+/// The timer used to delay title updates in order to prevent flickering.
+update_title_timer: ?c.guint = null,
+
 /// The core surface backing this surface
 core_surface: CoreSurface,
 
@@ -894,7 +897,23 @@ pub fn setTitle(self: *Surface, slice: [:0]const u8) !void {
     if (self.title_text) |old| alloc.free(old);
     self.title_text = copy;
 
+    // delay the title update to prevent flickering
+    if (self.update_title_timer) |timer| {
+        if (c.g_source_remove(timer) == c.FALSE) {
+            log.warn("unable to remove update title timer", .{});
+        }
+        self.update_title_timer = null;
+    }
+    self.update_title_timer = c.g_timeout_add(75, updateTitleTimerExpired, self);
+}
+
+fn updateTitleTimerExpired(ctx: ?*anyopaque) callconv(.C) c.gboolean {
+    const self: *Surface = @ptrCast(@alignCast(ctx));
+
     self.updateTitleLabels();
+    self.update_title_timer = null;
+
+    return c.FALSE;
 }
 
 pub fn getTitle(self: *Surface) ?[:0]const u8 {

From 2b245c965c6c6dcfa55a8a77b967b90fac9bcb8b Mon Sep 17 00:00:00 2001
From: Maciej Bartczak <39600846+maciekbartczak@users.noreply.github.com>
Date: Sun, 29 Dec 2024 09:27:59 +0100
Subject: [PATCH 2/2] Invalidate the timer when the surface is destroyed

---
 src/apprt/gtk/Surface.zig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/apprt/gtk/Surface.zig b/src/apprt/gtk/Surface.zig
index 115b7e13bf..81564f1a33 100644
--- a/src/apprt/gtk/Surface.zig
+++ b/src/apprt/gtk/Surface.zig
@@ -650,6 +650,7 @@ pub fn deinit(self: *Surface) void {
     // and therefore the unfocused_overlay has been destroyed as well.
     c.g_object_unref(self.im_context);
     if (self.cursor) |cursor| c.g_object_unref(cursor);
+    if (self.update_title_timer) |timer| _ = c.g_source_remove(timer);
     self.resize_overlay.deinit();
 }