Fix property inspector and widget tracker load behavior #8114
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References
#8113
Code changes
Adds layout restoration for the property inspector and fixes the case where a widget is added to a widget tracker when another widget already has focus. The edge case that this does not address is when an old widget is focused and new widget gets activated but never gets focused. In that case I think it is still fair to call the last focused widget the current one, as the focus tracker does.
The changes to the widget tracker need to be backported to 1.2.x.
User-facing changes
Fixes a user-facing bug where the wrong widget's properties are being inspected.
Backwards-incompatible changes
None.