Add Control.UpdateLayout() API #2382
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This adds the ability to update the control layout for platforms that use a deferred layout system such as Gtk, macOS, and Wpf.
This will ensure the control has had all of its layout applied so you can use its position and size right after this call.
Most platforms (except WinForms) use a deferred layout system so that after adding your control to the form dynamically it won't get laid out until the next idle loop.
This is useful when you need to know the dimensions of the control immediately.
Note that this can be an expensive operation, so it is recommended to only call this method when necessary and after all of the controls have been added/updated.