QA:Lots Of Tabs Tabstrip

Build 14935 on fix-tabstrip-next-bug
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Baseline History
Build 149355857efb
Current build. There are unaccepted changes, so build 14866 is still the baseline.
Build 1485955e568a
Accepted by Zhihao Cui.
Build 148217bbbab9
Auto-accepted
Build 148151c3b028
Accepted by Zhihao Cui.
Commenting is disabled because there's a newer build on this branch