Bug 23316 preference to turn off automagic-closing-brackets
there should be a way to turn it off - i'm not used to it and it gets in my way a bit
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
Control control= getControl();
			if (control instanceof Composite) {
				Composite composite= (Composite) control;
				composite.setLayout(new AdaptedRulerLayout(GAP_SIZE, this));
				fOverviewRuler.createControl(composite, this);
			}
		}
		
		public void hideOverviewRuler() {
			fIsOverviewRulerVisible= false;
			Control control= getControl();
			if (control instanceof Composite) {
				Composite composite= (Composite) control;
				composite.layout();
			}
		}
		
		public void showOverviewRuler() {
			fIsOverviewRulerVisible= true;
			Control control= getControl();
			if (control instanceof Composite) {
				Composite composite= (Composite) control;
				composite.layout();
			}
		}
		
		public boolean isOverviewRulerVisible() {
			return fIsOverviewRulerVisible;
		}