Animated chevrons in sidebar
Animated chevrons in sidebar

Summary: Sidebar collapsing finally feels right! Also made the sidebar a little bit less cramped by widening it.

Reviewed By: passy

Differential Revision: D19496743

fbshipit-source-id: 8dd93afc8ef542781b1c1598623d1c9cef9b6b66

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper