[Merge] lp:~gerboland/qtubuntu/delete-qraster-crash into lp:qtubuntu

[Gerry Boland]

Gerry Boland has proposed merging lp:~gerboland/qtubuntu/delete-qraster-crash into lp:qtubuntu with lp:~albaguirre/qtubuntu/mir-0.26.1-compat as a prerequisite.

Commit message:
BackingStore: make current only if no existing context current

Paraphrasing QOpenGLCompositorBackingStore: "With render-to-texture-widgets QWidget makes sure the context is made current before destroying backingstores. That is however not the case for windows with regular widgets only."


Requested reviews:
  Ubuntu Phablet Team (phablet-team)
  Unity8 CI Bot (unity8-ci-bot): continuous-integration

For more details, see:
https://code.launchpad.net/~gerboland/qtubuntu/delete-qraster-crash/+merge/317848
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~gerboland/qtubuntu/delete-qraster-crash into lp:qtubuntu.
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