08203c9c1e
On X11, _onFocusChanged() updates the input region, as well as the reactive-ness of the dialog's buttons. That method is not only used as signal handlers (which are correctly disconnected when the dialog is hidden), it also runs when the "show" transition completes. That's a problem if the transition is still ongoing when the dialog is hidden, as it will then only complete when it is replaced by the "hide" transition, after the this._dialog has been reset to null, and trying to access the dialog's buttons results in an error. Avoid this by explicitly removing all transition on hide before resetting the dialog. https://gitlab.gnome.org/GNOME/gnome-shell/issues/2467
GNOME Shell
GNOME Shell provides core user interface functions for the GNOME 3 desktop, like switching to windows and launching applications. GNOME Shell takes advantage of the capabilities of modern graphics hardware and introduces innovative user interface concepts to provide a visually attractive and easy to use experience.
For more information about GNOME Shell, including instructions on how to build GNOME Shell from source and how to get involved with the project, see the project wiki.
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