From 41740caa2e8542c155980486638f3fb0b781862a Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Mon, 26 Feb 2024 11:00:42 +0100
Subject: [PATCH] Don't rescale when top window is fullscreen or maximized
 (#919)

---
 src/Fl_Screen_Driver.cxx | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Fl_Screen_Driver.cxx b/src/Fl_Screen_Driver.cxx
index 1839c76dd..c13c6c1fd 100644
--- a/src/Fl_Screen_Driver.cxx
+++ b/src/Fl_Screen_Driver.cxx
@@ -497,7 +497,10 @@ int Fl_Screen_Driver::scale_handler(int event)
     if (Fl::grab()) return 0; // don't rescale when menu windows are on
     Fl_Widget *wid = Fl::focus();
     if (!wid) return 0;
-    int screen = Fl_Window_Driver::driver(wid->top_window())->screen_num();
+    Fl_Window *top = wid->top_window();
+    // don't rescale when top window is fullscreen or maximized
+    if (top->fullscreen_active() || top->maximize_active()) return 0;
+    int screen = Fl_Window_Driver::driver(top)->screen_num();
     Fl_Screen_Driver *screen_dr = Fl::screen_driver();
     static float initial_scale = screen_dr->scale(screen);
 #if defined(TEST_SCALING)