ModeSelector:With Many Viewports Equal

Build 1557 on dark-mode-adjustments
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Baseline History
Build 15577ab984a
Current build. There are unaccepted changes, so build 1484 is still the baseline.
Build 1484525e261 current baseline
Accepted by Tom Coleman.
Build 14251e549d5
Accepted by Jono Kolnik.
Build 1403734e3b6
Accepted by Jono Kolnik.
Build 87901c1d31
Accepted by Gert Hengeveld.
Commenting is disabled because there's a newer build on this branch