Stopping window screenshare leaves window frozen

[wilriker]

Steps to reproduce

1. Load an application that can screenshare on a vout
2. Load a second application to be shared on the same vout tiled
3. Start screensharing the window of the second app
4. Interact with the shared app
5. Stop screenshare
6. Interact with the previously shared app
7. Toggle to any other workspace and back
8. Interact with the previously shared app

Observed behavior

In step 6 you get no visual feedback of your interaction with the app. In step 8 (after rerendering is forced by switching workspaces) first you will notice your previous interaction did in fact happen and second you will now get visual feedback again.

Expected behavior

The app keeps receiving rendering updates after screenshare has been stopped.

Note that this works fine when sharing the full output.