fix bad tab page preview for the first tab set

cezaraugusto · syuan100 · commit 539389b9a412 · 2017-11-08T22:54:29.000-08:00
fix brave#11269 Auditors: @luixxiul Test Plan: npm run test -- --grep="tab pages tab page previews hovering over a tab page changes it"
diff --git a/js/state/frameStateUtil.js b/js/state/frameStateUtil.js
@@ -487,7 +487,7 @@ const getTabPageIndex = (state) => {
   const tabPageIndex = state.getIn(['ui', 'tabs', 'tabPageIndex'], 0)
   const previewTabPageIndex = state.getIn(['ui', 'tabs', 'previewTabPageIndex'])
 
-  return previewTabPageIndex || tabPageIndex
+  return previewTabPageIndex != null ? previewTabPageIndex : tabPageIndex
 }
 
 /**

Original file line number	Diff line number	Diff line change
`@@ -487,7 +487,7 @@ const getTabPageIndex = (state) => {`
`487`	`487`	`const tabPageIndex = state.getIn(['ui', 'tabs', 'tabPageIndex'], 0)`
`488`	`488`	`const previewTabPageIndex = state.getIn(['ui', 'tabs', 'previewTabPageIndex'])`
`489`	`489`
`490`		`- return previewTabPageIndex \|\| tabPageIndex`
	`490`	`+ return previewTabPageIndex != null ? previewTabPageIndex : tabPageIndex`
`491`	`491`	`}`
`492`	`492`
`493`	`493`	`/**`