From 58c9c0ba7b79ad08484ec4ab40e411098ca6e1d1 Mon Sep 17 00:00:00 2001
From: Frank Praznik <[EMAIL REDACTED]>
Date: Wed, 11 Mar 2026 20:38:26 -0400
Subject: [PATCH] wayland: Prevent the window from errantly growing when scale
to display is used
Some compositors will send a configure event immediately after a scale event, however, this event can contain the old logical size, and should be ignored, or the window will incorrectly change size when moved between displays with differing scale factors.
Store the last requested logical size as the last configure size when resizing a floating window due to a scale change, so a configure event immediately following with the old size will be ignored.
(cherry picked from commit 18219d5b53a7103152a961b135129a93f6dc4cc8)
---
src/video/wayland/SDL_waylandwindow.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/src/video/wayland/SDL_waylandwindow.c b/src/video/wayland/SDL_waylandwindow.c
index 5dac6f22a84c5..4e5446a666b22 100644
--- a/src/video/wayland/SDL_waylandwindow.c
+++ b/src/video/wayland/SDL_waylandwindow.c
@@ -1528,6 +1528,16 @@ static void Wayland_HandlePreferredScaleChanged(SDL_WindowData *window_data, dou
* the new backbuffer dimensions.
*/
if (window_data->floating) {
+ /* Some compositors will send a configure event immediately after a scale event, however,
+ * this event can contain the old logical size, and should be ignored, or the window can
+ * incorrectly change size when moved between displays with differing scale factors.
+ *
+ * Store the last requested logical size as the last configure size, so a configure event
+ * with the old size will be ignored.
+ */
+ window_data->last_configure.width = window_data->requested.logical_width;
+ window_data->last_configure.height = window_data->requested.logical_height;
+
window_data->requested.logical_width = PixelToPoint(window_data->sdlwindow, window_data->requested.pixel_width);
window_data->requested.logical_height = PixelToPoint(window_data->sdlwindow, window_data->requested.pixel_height);
} else {