[Merge] lp:~dandrader/qtubuntu/resizeCatchUp into lp:qtubuntu

[Daniel d'Andrada]

Daniel d'Andrada has proposed merging lp:~dandrader/qtubuntu/resizeCatchUp into lp:qtubuntu.

Commit message:
UbuntuWindow - keep redrawing a bit until you get the promised resized buffer

Usually you get a resized buffer on the next buffer swap, but it's not uncommon
that it shows up only after the second one.

+ Improve and clean up UbuntuWindow debugging. For some reason I don't get
  qDebug() output even if I compile qtubuntu with CONFIG+=debug. Probably
  because if the application using qtubuntu was built with a release config
  it will silence qDebug() from the libs it loads as well.

Requested reviews:
  Ubuntu Phablet Team (phablet-team)
Related bugs:
  Bug #1466510 in unity8 (Ubuntu): "Stretched screen (briefly) after rotating"
  https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1466510

For more details, see:
https://code.launchpad.net/~dandrader/qtubuntu/resizeCatchUp/+merge/269195
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~dandrader/qtubuntu/resizeCatchUp into lp:qtubuntu.
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