Unity crash using application window overview and workspace switcher at the same time

Bug #1684620 reported by Stefan Helmert
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This bug affects 1 person
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unity (Ubuntu)
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Bug Description

On Ubuntu 16.04.2: If I have multiple windows of one apllication open, I can click the app on the Launcher and see all the windows of this app in an overview screen. If I have the overview screen open and then i press super+s to show the workspace overview, the Unity desktop runs in a defective state.

The defective state means: The Overview mode for multiple windows of one application is not more available. The titlebar of the active window is shown two time: at top off the window and in top of the screen, but only that one on top of the window is working.

Further use of Unity in defective state will result in freeze and automatic restart of Unity.

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