[Wayland-bugs] [Bug 768016] [Wayland] Submenus often get closed after ~2 seconds

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768016

--- Comment #4 from Olivier Fourdan <ofourdan at redhat.com> ---
I reckon it's a difference in the coordinates between X11 and Wayland.

If we look at gtk_menu_set_submenu_navigation_region():

  https://git.gnome.org/browse/gtk+/tree/gtk/gtkmenu.c#n4185

which is called in both X11 and Wayland cases as soon as the pointer leaves the
first menu to enter the submenu, we see that the
gtk_menu_stop_navigating_submenu_cb() timeout is set when event->x >= 0 &&
event->x < width, width being the width of the window where the event is coming
from.

In the X11 case, we have the event->x slightly (couple of pixels) farther than
the actual left window width (e.g. x = 450, width = 448) which sounds right
because the pointer has left the previous item therefore it's outside the
window.

But in the Wayland case, we have the event x slightly less that the actual left
window width (e.g. x = 396, width = 408), and therfore we enter the case where
the timeout will be set up.

The Wayland case seems wrong, the event x should not be less than the width of
the window that was the pointer just left (otherwise it would not have left the
window, would we?).

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