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adw-view-switcher-title: Clear pending idle callback on unrealize

Philip Withnall requested to merge pwithnall/libadwaita:view-switcher-title-cleanup into main

It’s possible (but quite unlikely) for the widget to be unrealized and destroyed while check_window_width() is pending in an idle callback.

If that happens, check_window_width() will be called on a disposed AdwViewSwitcherTitle instance, and will crash.

Avoid that by explicitly removing the idle source when the widget is unrealized.

Signed-off-by: Philip Withnall pwithnall@endlessos.org

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