Commit 08aade4b authored by Olivier Fourdan's avatar Olivier Fourdan 🛠

wayland: check parent surface for subsurface

When an event is received while a tooltip is showing, the GtkTooltip's
event handling code can end up calling gdk_window_set_transient_for()
from gtk_tooltip_set_last_window().

The Wayland GDK backend will try to automatically create a subsurface
in gdk_wayland_window_set_transient_for() but if the parent surface is
gone meanwhile, this will will cause a crash when trying to create a
subsurface from a parent with a null surface.

Checking for the parent is not sufficient, we ought to check for the
parent surface as well to avoid the crash.
parent a84fc387
......@@ -1312,7 +1312,7 @@ gdk_wayland_window_create_subsurface (GdkWindow *window)
if (impl->transient_for)
parent_impl = GDK_WINDOW_IMPL_WAYLAND (impl->transient_for->impl);
if (parent_impl)
if (parent_impl && parent_impl->display_server.wl_surface)
display_wayland = GDK_WAYLAND_DISPLAY (gdk_window_get_display (window));
impl->display_server.wl_subsurface =
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