ProjectExplorer: Add "link back from issues" functionality

... to the app output pane.

Change-Id: I3e11f63a42fb30ae4e40da50d5ba8143ce99cd65
Reviewed-by: hjk <hjk@qt.io>

src/plugins/coreplugin/ioutputpane.h

@@ -56,6 +56,7 @@ public:
     virtual QList<QWidget *> toolBarWidgets() const;
     virtual QString displayName() const = 0;
     virtual const QList<OutputWindow *> outputWindows() const { return {}; }
+    virtual void ensureWindowVisible(OutputWindow *) { }
 
     virtual int priorityInStatusBar() const = 0;