Only set active tab when value changes

Fix #6791

Auditors: @bridiver

I think the real raeson this is happening is because of the async updating which we'll be removing, but is too risky to do for 0.13.0.

I think this is probably better to do in general though anyway

js/components/frame.js

@@ -395,7 +395,9 @@ class Frame extends ImmutableComponent {
       if (this.webRTCPolicy !== this.getWebRTCPolicy()) {
         this.webview.setWebRTCIPHandlingPolicy(this.getWebRTCPolicy())
       }
-      this.webview.setActive(this.props.isActive)
+      if (prevProps.isActive !== this.props.isActive) {
+        this.webview.setActive(this.props.isActive)
+      }
       this.webview.setTabIndex(this.props.tabIndex)
       this.handleShortcut()