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Description
This adds a HotkeyBlocker class that is similar to SignalBlocker. It is used when selection dialogs are opened and because they are modal, hotkeys shouldn't be able to be used.
Motivation and Context
Simpler alternative to #8725
Fixes #7824
How Has This Been Tested?
Opened file dialog from image context bar widget and made sure hotkeys were disabled when browsing and re-enabled when it was closed.
Types of changes
Checklist: