Code review comment for lp:~feng-kylin/unity8/AddIndicationForRunningApp

Seems like a bug in unity8. I use the trunk code to test,run unity8 trough qtcreate repeatedly， it also got a "QML Image: Cannot open: file:///home/phablet/shell/qml/Launcher/graphics/focused_app_arrow.png" error, and the indication for focused app disappeared. hm... Keep investigating this.