[Wayland-bugs] [Bug 781945] New: SIGSEGV dragging window on Wayland when toplevel window set_transient_for is set to another toplevel

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781945

            Bug ID: 781945
           Summary: SIGSEGV dragging window on Wayland when toplevel
                    window set_transient_for is set to another toplevel
    Classification: Platform
           Product: gtk+
           Version: 3.22.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: Backend: Wayland
          Assignee: gtk-bugs at gtk.org
          Reporter: dustin at virtualroadside.com
        QA Contact: gtk-bugs at gtk.org
                CC: rob at robster.org.uk, wayland-bugs at lists.freedesktop.org
     GNOME version: ---

Seems to be triggered when the following is true:
* Toplevel window has set_transient_for(another toplevel window)
* Window GdkTypeHint is set to "utility"
* Dragging the incorrectly configured window

Simple pygobject testcase to trigger this:
https://gist.github.com/virtuald/87e64c0610ae0204a2969efc48e7ebb4

Platform is Fedora 25, GTK+ 3.22.12

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