[Merge] lp:~gerboland/qtubuntu/rasterGLSurface-fixes into lp:qtubuntu

[Gerry Boland]

Gerry Boland has proposed merging lp:~gerboland/qtubuntu/rasterGLSurface-fixes into lp:qtubuntu.

Commit message:
Small BackingStore fixes: call makeCurrent on texture changes, and choose correct QImage format to avoid bit swizzling

Requested reviews:
  Ubuntu Phablet Team (phablet-team)

For more details, see:
https://code.launchpad.net/~gerboland/qtubuntu/rasterGLSurface-fixes/+merge/308364
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~gerboland/qtubuntu/rasterGLSurface-fixes into lp:qtubuntu.
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