[Webkit-unassigned] [Bug 151132] New: [GTK] Runtime critical warnings when closing a page containing windowed plugins

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=151132

            Bug ID: 151132
           Summary: [GTK] Runtime critical warnings when closing a page
                    containing windowed plugins
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: Gtk
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cgarcia at igalia.com
                CC: bugs-noreply at webkitgtk.org, gns at gnome.org,
                    pnormand at igalia.com, zan at falconsigh.net

(WebKitPluginProcess:31915): Gtk-CRITICAL **: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed

This is because our plugin widget that is a GtkPlug (derived from GtkWindow) can receive the delete-event signal before NetscapePlugin::platformDestroy is called. The delete-event signal, by default, destroys the window when the signal is not handled. So after the delete-event the GtkPlug is destroyed, but our pointer hasn't been reset. We can handle the delete-event using gtk_widget_hide_on_delete as callback, so that the plugin widget is hidden instead of destroyed.

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