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Created attachment 247604 [details] Theme for org.eclipse.rap.examples with a fadeOut for Shell If in the theme the shell has an animation with a fadeOut, and if a button is selected in this shell while it is fading out, the application crashes by displaying "Error: Error: Invalid target for ServerObject, or target not in ObjectManager".
I can reproduce it with both RAP 2.3.1 and current master (3.0.0M2).
When shell is closing (fading-out), all its children are already disposed. Mouse click on a button will trigger notify operation on disposed (already removed from ObjectManager) widget. We should not send operations (use getRemoteObject) on already disposed widgets.