Answered
Radial Filter
Is there a keyboard shortcut for invert mask on the radial filter?
Is there a keyboard shortcut for invert mask on the radial filter?
Actually, it was available at your fingertips all the time:
If you click the tiny (?) in the circle in the top of the mask panel, it brings up a list of available shortcuts. The KBSC you are looking for is about 4/5 of the way down the left column.

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