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Ribbon focus war #2269

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SamBent commented Dec 2, 2019

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Description

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.

Customer Impact

Crash.

Regression

No. (Port of servicing fix for .NET 4.7 - 4.8)

Risk

Low

Fixes #2220
StackOverflow due to focus war in RibbonMenuButton

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