ModeSelector:With Single Viewport Changed

Build 1558 on dark-mode-adjustments
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Baseline History
Build 1558be6704c
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