TreeWidget: Ensure globalSelection is correctly set when opening context menu #13710
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What it does
Closes #12937
This ensures the globalSelection is set correctly when focusing a tree widget. There are cases where when restoring the layout the global selection is not set because the widget is not yet active and when opening the context menu there is no selection changed event so the global selection stays at the old value. See the linked issue
How to test
Taken from the linked issue
Follow-ups
Review checklist
Reminder for reviewers