From 6fc4bef0e38ef4e2b3fe015283e4705e1600afaa Mon Sep 17 00:00:00 2001
From: Oliver Bechstein-Rumble
 <58312347+OllieBechstein@users.noreply.github.com>
Date: Fri, 24 Oct 2025 20:33:55 +0100
Subject: [PATCH] Fix #14240: Remember previous GUI scale when toggling
 auto-detect (#14380)

---
 src/settings_gui.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/settings_gui.cpp b/src/settings_gui.cpp
index af466bf40b..7b0c9e1a15 100644
--- a/src/settings_gui.cpp
+++ b/src/settings_gui.cpp
@@ -415,6 +415,7 @@ struct GameOptionsWindow : Window {
 	bool reload = false;
 	bool gui_scale_changed = false;
 	int gui_scale = 0;
+	static inline int previous_gui_scale = 0; ///< Previous GUI scale.
 	static inline WidgetID active_tab = WID_GO_TAB_GENERAL;
 
 	GameOptionsWindow(WindowDesc &desc) : Window(desc), filter_editbox(50)
@@ -1076,9 +1077,12 @@ struct GameOptionsWindow : Window {
 			case WID_GO_GUI_SCALE_AUTO:
 			{
 				if (_gui_scale_cfg == -1) {
-					_gui_scale_cfg = _gui_scale;
+					_gui_scale_cfg = this->previous_gui_scale; // Load the previous GUI scale
 					this->SetWidgetLoweredState(WID_GO_GUI_SCALE_AUTO, false);
+					if (AdjustGUIZoom(false)) ReInitAllWindows(true);
+					this->gui_scale = _gui_scale;
 				} else {
+					this->previous_gui_scale = _gui_scale; // Set the previous GUI scale value as the current one
 					_gui_scale_cfg = -1;
 					this->SetWidgetLoweredState(WID_GO_GUI_SCALE_AUTO, true);
 					if (AdjustGUIZoom(false)) ReInitAllWindows(true);