Add a simple checkbox option in the Effect Controls panel for masks to make them static. That way when you keyframe an image or video clip to move around, the mask won't move with it. That way we don't have to go through hoops copy pasting masks on color mattes on a new track, nesting the things we want effected by the masks, or animating the mask path with keyframes so it moves in the opposite direction of the content we're masking, etc.
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