Fix the app window pops up second to foreground when a new message is received

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Mattermost Desktop Application Changelog
 
+## Release v3.4.1
+
+Release date: TBD
+
+### Bug Fixes
+
+#### macOS
+ - Fixed an issue where the app window pops up second to foreground when a new message is received
+
+----
+
 ## Release v3.4.0
 
 Release date: September 22, 2016

src/browser/index.jsx

@@ -113,8 +113,10 @@ var MainPage = React.createClass({
       }
     });
   },
-  componentDidUpdate: function() {
-    this.refs[`mattermostView${this.state.key}`].focusOnWebView();
+  componentDidUpdate: function(prevProps, prevState) {
+    if (prevState.key !== this.state.key) { // i.e. When tab has been changed
+      this.refs[`mattermostView${this.state.key}`].focusOnWebView();
+    }
   },
   handleSelect: function(key) {
     const newKey = (this.props.teams.length + key) % this.props.teams.length;