From f35ae7122d86269ae38c849908ab996a15e15319 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Tue, 27 Feb 2024 08:46:40 +0100
Subject: Stop GUI scaling when window is maximized or full screen (#919)

Don't rescale when any top window on same screen as focus window is fullscreen or maximized
---
 src/Fl_Screen_Driver.cxx | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/Fl_Screen_Driver.cxx b/src/Fl_Screen_Driver.cxx
index c13c6c1fd..d127b6b1e 100644
--- a/src/Fl_Screen_Driver.cxx
+++ b/src/Fl_Screen_Driver.cxx
@@ -498,10 +498,19 @@ int Fl_Screen_Driver::scale_handler(int event)
     Fl_Widget *wid = Fl::focus();
     if (!wid) return 0;
     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();
+    // don't rescale when any top window on same screen as
+    // focus window is fullscreen or maximized
+    top = Fl::first_window();
+    while (top) {
+      if (!top->parent() &&
+          (Fl_Window_Driver::driver(top)->screen_num() == screen ||
+           screen_dr->rescalable() == SYSTEMWIDE_APP_SCALING)) {
+        if (top->fullscreen_active() || top->maximize_active()) return 0;
+      }
+      top = Fl::next_window(top);
+    }
     static float initial_scale = screen_dr->scale(screen);
 #if defined(TEST_SCALING)
     // test scaling factors: lots of values from 0.3 to 8.0
-- 
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