info for my future self: 
I investigated this bug a few days ago, when Trevinho first reported it 
directly to me.

It turns out the loop is triggered when the view is resized so that the
column gets a *negative* width.

At that point you see columns height going 0 to 5 (which is rectangle's
height) and back to 0, in a loop, and width going -X to 0 to -X again.

** Summary changed:

- When SlotsLayout uses a Column as mainSlot and view is resized horizontally 
an inifinite resize loop starts
+ SlotsLayout with Column as mainSlot: endless loop when resizing view so that 
Column has negative width

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https://bugs.launchpad.net/bugs/1630167

Title:
  SlotsLayout with Column as mainSlot: endless loop when resizing view
  so that Column has negative width

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