From 6732044a0789d45b5daa5a376474ca832db44ddb Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Thu, 6 Oct 2022 08:43:09 +0200
Subject: Fix use of several FLTK widgets above an GL scene. The code failed
 with 2 or more widgets when FLTK would trigger partial redraws of the
 widgets, unless the Fl_Gl_Window was FL_DAMAGE_ALL.

This commit also adds a second FLTK widget to example/OpenGL3test to
check this multiple widget situation, and fixes an error where operator ! was used
instead of ~ .
---
 src/Fl_Gl_Window.cxx | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src')

diff --git a/src/Fl_Gl_Window.cxx b/src/Fl_Gl_Window.cxx
index 4bd4397e1..ae1e66bd6 100644
--- a/src/Fl_Gl_Window.cxx
+++ b/src/Fl_Gl_Window.cxx
@@ -344,6 +344,7 @@ void Fl_Gl_Window::draw_overlay() {}
  */
 void Fl_Gl_Window::draw_begin() {
   if (mode() & FL_OPENGL3) pGlWindowDriver->switch_to_GL1();
+  damage(FL_DAMAGE_ALL); // always redraw all GL widgets above the GL scene
   Fl_Surface_Device::push_current( Fl_OpenGL_Display_Device::display_device() );
   Fl_OpenGL_Graphics_Driver *drv = (Fl_OpenGL_Graphics_Driver*)Fl_Surface_Device::surface()->driver();
   drv->pixels_per_unit_ = pixels_per_unit();
-- 
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