Bug 561370 might have moved to happening less often (or never when windowed) since the switch to Wayland. If we can show it's still intermittent when windowed under Xorg then I would recommend marking this as a duplicate of bug 561370.
Bug 561370 might have moved to happening less often (or never when windowed) since the switch to Wayland. If we can show it's still intermittent when windowed under Xorg then I would recommend marking this as a duplicate of bug 561370.