Avoid glpuzzle crash when resizing while puzzle is spinning.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx b/src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx
index fc9d12dcb..8165152b8 100644
--- a/src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx
+++ b/src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx
@@ -307,8 +307,13 @@ void Fl_Wayland_Gl_Window_Driver::swap_buffers() {
       wl_display_read_events(Fl_Wayland_Screen_Driver::wl_display);
       wl_display_dispatch_queue_pending(Fl_Wayland_Screen_Driver::wl_display,  gl_event_queue);
     }
+    if (!egl_window) return;
+    int W = 0, H;
+    if (!pWindow->parent()) wl_egl_window_get_attached_size(egl_window, &W, &H);
+    if (!egl_resize_in_progress ||  W == 0) {
+      eglSwapBuffers(Fl_Wayland_Gl_Window_Driver::egl_display, egl_surface);
+    }
     egl_resize_in_progress = false;
-    eglSwapBuffers(Fl_Wayland_Gl_Window_Driver::egl_display, egl_surface);
   }
 }