[Wayland-bugs] [Bug 761156] [Wayland] Setting a popover 'relative_to' a widget on an offscreen window crashes gtk+

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761156

--- Comment #5 from Jonas Ådahl <jadahl at gmail.com> ---
Created attachment 322536
  --> https://bugzilla.gnome.org/attachment.cgi?id=322536&action=edit
GtkWindow: Don't realize popover if added to offscreen window

Don't try to realize a popover widget if it was added to an offscreen
window. Doing so would cause the popover GdkWindow to be set transient
to the offscreen GdkWindow, when running the Wayland backend, which is
invalid. Instead wait until the popover is added to a onscreen window
before realizing it.

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