Wayland + full-size subwindow resizing issue - cont'd (#878)

Implement a less strict handling of resizing of a decorated window entirely covered
by a subwindow where throttling of fast resize commands is guided by the
value of the in_use member variable of the window's wld_buffer.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx b/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
index ac34952e0..e32943caa 100644
--- a/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
+++ b/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
@@ -909,9 +909,13 @@ static void handle_configure(struct libdecor_frame *frame,
 #ifndef LIBDECOR_MR131
   bool in_decorated_window_resizing = (window->state & LIBDECOR_WINDOW_STATE_RESIZING);
 #endif
-  if (in_decorated_window_resizing && window->buffer && window->buffer->cb) {
+  bool condition = in_decorated_window_resizing && window->buffer;
+  if (condition) { // see issue #878
+    condition = (window->covered ? window->buffer->in_use : (window->buffer->cb != NULL));
+  }
+  if (condition) {
     // Skip resizing & redrawing. The last resize request won't be skipped because
-    // in_decorated_window_resizing will be false then.
+    // in_decorated_window_resizing will be false or cb will be NULL then.
     return;
   }