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If you set the overlay theme on a page, that theme swatch will then continue to override all subsequent dialog overlays until you refresh. To reproduce, go here:
This will also carry over onto other pages. If you navigate to the transitions page, all the dialogs there will have an E swatch.
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parent is actually what we're looking for here, given that getInherit…
…edTheme mimics the closest() method. Fixes #3779
That one was tricky. Think we're good now...