Fix for bug in Mutter Wayland compositor (#878)

Mutter implements too strictly this rule expected from compositors about "frame callbacks" :
"A server should avoid signaling the frame callbacks if the surface is not visible in any way,
e.g. the surface is off-screen, or completely obscured by other opaque surfaces."
When a window is being interactively resized, it makes no sense to create a frame callback
for an entirely covered surface but then never signal the surface can be redrawn,
because this blocks the resize operation.

Neither KWin nor Weston have this problem.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/drivers/Wayland/Fl_Wayland_Window_Driver.H b/src/drivers/Wayland/Fl_Wayland_Window_Driver.H
index 30e19e184..b3d530f00 100644
--- a/src/drivers/Wayland/Fl_Wayland_Window_Driver.H
+++ b/src/drivers/Wayland/Fl_Wayland_Window_Driver.H
@@ -163,6 +163,7 @@ struct wld_window {
   int floating_width;
   int floating_height;
   int state;
+  bool covered;
 };