[Merge] lp:~nick-dedekind/qtubuntu/occlusion-2.0 into lp:qtubuntu

[Michael Terry]

Review: Needs Information

Desktop mode seems to work fine.

But I get unity8 crashes if I flip between windowed and staged mode on my phone.  They don't seem to be there without these branches.

gsettings set com.canonical.Unity8 usage-mode Staged
vs
gsettings set com.canonical.Unity8 usage-mode Windowed

I'm not sure what the exact trigger is.  I had Music app playing music in the background, trying to render when it can.  And some other windows, one was maximized.  And I would just move them around, reorder them, and switch usage-modes.  Got a crash a couple times that way.

Do you see that?
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https://code.launchpad.net/~nick-dedekind/qtubuntu/occlusion-2.0/+merge/283194
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