fix sidebar scrollbars

Summary: Only show scrollbars in sidebar when necessary.

Reviewed By: jknoxville, passy

Differential Revision: D14341446

fbshipit-source-id: e75f02b9de7796fc9ed8a42618ade3be015a1889

src/chrome/MainSidebar.js

@@ -103,7 +103,7 @@ const PluginName = styled(Text)(props => ({
 
 const Plugins = styled(FlexColumn)({
   flexGrow: 1,
-  overflow: 'scroll',
+  overflow: 'auto',
 });
 
 const PluginDebugger = styled(FlexBox)(props => ({

src/chrome/UserAccount.js

@@ -18,6 +18,7 @@ const Container = styled(FlexRow)({
   padding: '5px 10px',
   borderTop: `1px solid ${colors.blackAlpha10}`,
   fontWeight: 500,
+  flexShrink: 0,
 });
 
 const ProfilePic = styled('img')({