Bug 62896 [misc] Quick Outline should not show override indicators if decorator disabled
I20040519 The quick outline shows override indicators no matter whether the Override indicator decorator is enabled in the prefs or not. We should only install the decorator if the prefs says so since this is a performance saver.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/JavaOutlineInformationControl.java
}
			}
			return super.getChildren(element);
		}
		
		/**
		 * {@inheritDoc}
		 */
		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
			super.inputChanged(viewer, oldInput, newInput);
			fTypeHierarchies.clear();
		}
		
		/**
		 * {@inheritDoc}
		 */
		public void dispose() {
			super.dispose();
			fTypeHierarchies.clear();
		}
		
		/**
		 * Returns the primary type of a compilation unit (has the same
		 * name as the compilation unit).
		 * 
		 * @param compilationUnit the compilation unit
		 * @return returns the primary type of the compilation unit, or
		 * <code>null</code> if is does not have one
		 */
		private IType getMainType(ICompilationUnit compilationUnit) {