UI interactions not supported with MM_WRAP?

While mucking in UI internals i noticed that MM_WRAP causes mouse to be grabbed. Clicks are not processed when mouse is grabbed. Docs do mention that this happens but do not mention why. So why is this so? And when should MM_WRAP be used? And is UI interaction supported when MM_WRAP is enabled?

Gave it a quick test, MM_WRAP does disable UI interaction.

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