Comment 0 for bug 995892

To reproduce:
- Open two windows in an application, e.g. Terminal
- Minimize one of those windows
- With the other window focussed, press Alt+` to switch focus to the other window

Current behaviour:
- Focus is switched to the other window but it isn't painted correctly: it is shown completely in white

Expected behaviour:
- Focus is switched to the other window and it is painted correctly, i.e. the window contents are drawn on the screen