[Resize content][1/n] Break horizontal scrolling area into final-ish hierarchy #110
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Stack PR by STACK ATTACK:
Summary
This PR begins a PR stack that implements the resize of the lanes area.
In this PR, the view hierarchy is overhauled to more closely resemble
the final one. This is the new view hierarchy:
ResizableVerticalSplitView)
This PR must be landed with the PRs stacked above it in order not to
break master.
Test Plan
yarn lintyarn flow: no errors in changed codeyarn testKnown issues
intentional; it'll be fixed in a future PR in this stack ([Resize content][3/n] Sync horizontal pan and zoom states #108).
future PR in this stack ([Resize content][2/n] Implement ResizableSplitView #107).