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Created attachment 230259 [details] The patch. The problem is easily visible on Fedora 19 component part of the ControlExample is not visible (0,0) sized - Gtk-CRITICAL **: gtk_widget_set_allocation: assertion `gtk_widget_get_visible (widget) || gtk_widget_is_toplevel (widget)' failed The attached patch fixes it. It's left for gtk 2.18+ as it seems to not make a difference on gtk 2.x.
Created attachment 230260 [details] Broken rendering.
As this was preventing even the workspace selection to draw anything I decided to push a slightly modified patch (set visible for GTK 3 only) to allow starting with GTK 3.8. Commit: http://git.eclipse.org/c/platform/eclipse.platform.swt.git/commit/?id=873a9a76611be625b45716322ad5255e3ae4a6fc
*** Bug 407374 has been marked as a duplicate of this bug. ***