Fix OptionContainer and SplitContainer's Window and App tracking #4113
+138
−1
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Fixes #3929.
When adding or removing tabs from OptionContainer, or when setting the content of SplitContainer, the window property of the widget, the app property of the widget, and the App and Window's widget registry are now all kept up to date. This is accomplished by patching the relevant setters or modification functions to do the proper things.
PR Checklist: