Ribbon focus war #2269
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An app that programmatically disables a RibbonMenuButton and replaces its menu items with new ones can cause a focus war leading to infinite recursion and StackOverflow. This can happen if the user presses the toggle button (which opens the menu dropdown) and drags the mouse over the dropdown, and the programmatic disable/replace occurs before the user releases the mouse button.
No. (Port of servicing fix for .NET 4.7 - 4.8)