CI system is adjusted, so that OpenGL should work. At least latest
run didn't show the EGL warnings in the lock screen test. So let's
try to enable again. It's possible that this fails horribly. If that's
the case I'll revert again.
The dontCrashGlxgearsTest is kept on QPainter as locally it crashes
on teardown (needs fixing).
The problem we had was closing a glxgears through an Aurorae theme
crashed KWin inside QtQuick.
This test case simulates the sequence:
1. starts glxgears
2. wait till we have a Client for it
3. send mouse move to guessed close button position
4. send mouse press/release at that position
5. verify the window is closed
6. verify glxgears exits
With the given commit reverted this crashes, with it in place it passes.
Please note: on CI it might fail as glxgears is not yet installed. [1]
Also we cannot enforce using Aurorae from the test yet, though on
the CI system it should get picked automatically as no other deco
plugin should be installed.
[1] Sysadmin ticket already created
