Bug 40785 [plan item] Overview ruler improvements
- navigation from ruler to editor - hovering over header area shows number of errors/warning (header annotations in general)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
/*
		 * @see org.eclipse.swt.events.MouseListener#mouseDoubleClick(org.eclipse.swt.events.MouseEvent)
		 */
		public void mouseDoubleClick(MouseEvent e) {}
		/*
		 * @see org.eclipse.swt.events.MouseListener#mouseDown(org.eclipse.swt.events.MouseEvent)
		 */
		public void mouseDown(MouseEvent event) {
			
			if (!fActive)
				return;
				
			if (event.stateMask != fKeyModifierMask) {
				deactivate();
				return;	
			}
			
			if (event.button != 1) {
				deactivate();
				return;	
			}			
		}
		/*
		 * @see org.eclipse.swt.events.MouseListener#mouseUp(org.eclipse.swt.events.MouseEvent)
		 */
		public void mouseUp(MouseEvent e) {
			if (!fActive)
				return;
				
			if (e.button != 1) {