From 46e681561241d0a123dfc08c234745c40c4a262a Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Sun, 4 Jan 2026 16:45:11 +0100
Subject: Windows: improve moving window across screens having distinct scale
 factors.

---
 src/drivers/WinAPI/Fl_WinAPI_Gl_Window_Driver.cxx | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/drivers/WinAPI/Fl_WinAPI_Gl_Window_Driver.cxx')

diff --git a/src/drivers/WinAPI/Fl_WinAPI_Gl_Window_Driver.cxx b/src/drivers/WinAPI/Fl_WinAPI_Gl_Window_Driver.cxx
index 375408496..8e199b09c 100644
--- a/src/drivers/WinAPI/Fl_WinAPI_Gl_Window_Driver.cxx
+++ b/src/drivers/WinAPI/Fl_WinAPI_Gl_Window_Driver.cxx
@@ -454,6 +454,19 @@ void Fl_WinAPI_Gl_Window_Driver::switch_back() {
 }
 
 
+class Fl_WinAPI_Gl_Plugin : public Fl_WinAPI_Plugin {
+public:
+  Fl_WinAPI_Gl_Plugin() : Fl_WinAPI_Plugin(name()) { }
+  const char *name() override { return "gl.winapi.fltk.org"; }
+  void invalidate(Fl_Window *w) override {
+    w->as_gl_window()->valid(0);
+  }
+};
+
+
+static Fl_WinAPI_Gl_Plugin Gl_Invalidate_Plugin;
+
+
 FL_EXPORT HGLRC fl_win32_glcontext(GLContext rc) { return (HGLRC)rc; }
 
 #endif // HAVE_GL
-- 
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