Backport PR #591: use overflow: 'auto' for historywrapper and branchmenuwrapper

Author: fcollonval

src/style/BranchMenu.ts

@@ -101,7 +101,7 @@ export const listWrapperClass = style({
   maxHeight: '400px',
 
   overflow: 'hidden',
-  overflowY: 'scroll'
+  overflowY: 'auto'
 });
 
 export const listItemClass = style({

src/style/HistorySideBarStyle.ts

@@ -10,5 +10,5 @@ export const historySideBarStyle = style({
   marginBlockEnd: 0,
   paddingLeft: 0,
 
-  overflowY: 'scroll'
+  overflowY: 'auto'
 });