Dialog: fix multiple binding loops

Akseli Lahtinenrequested to merge
work/akselmo/dialog-fix-binding-loops into master

There was multiple bindingloops:

  • widthHint.value
  • calculatedImplicitWidth
  • calculatedImplicitHeight

For example calculatedImplicitWidth was assigning contentItem.width to contentItem.implicitWidth, which never should be done.

The widthHint was basically looping on itself, but the same result could be done with less calculations.

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