ModeSelector:With Single Viewport Changed

Build 1557 on dark-mode-adjustments
Dark
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Baseline History
Build 15577ab984a
Current build. There are unaccepted changes, so build 931 is still the baseline.
Build 931b1dae5b current baseline
Accepted by Tom Coleman.
Build 87901c1d31
Accepted by Gert Hengeveld.
Commenting is disabled because there's a newer build on this branch