Bug 41443 overview ruler not working
smoke test for 20030812 The overview ruler in the Java editor does not work when starting with a fresh workspace as described in the smoke test scenario.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
if (store.contains(PreferenceConstants.QUICK_DIFF_ADDED_COLOR)) {
					if (store.isDefault(PreferenceConstants.QUICK_DIFF_ADDED_COLOR))
						rgb= PreferenceConverter.getDefaultColor(store, PreferenceConstants.QUICK_DIFF_ADDED_COLOR);
					else
						rgb= PreferenceConverter.getColor(store, PreferenceConstants.QUICK_DIFF_ADDED_COLOR);
				}
			}
			changeColumn.setAddedColor(manager.getColor(rgb));
				
			rgb= null;
			
			if (!store.getBoolean(PreferenceConstants.QUICK_DIFF_DELETED_COLOR)) {
				if (store.contains(PreferenceConstants.QUICK_DIFF_DELETED_COLOR)) {
					if (store.isDefault(PreferenceConstants.QUICK_DIFF_DELETED_COLOR))
						rgb= PreferenceConverter.getDefaultColor(store, PreferenceConstants.QUICK_DIFF_DELETED_COLOR);
					else
						rgb= PreferenceConverter.getColor(store, PreferenceConstants.QUICK_DIFF_DELETED_COLOR);
				}
			}
			changeColumn.setDeletedColor(manager.getColor(rgb));
		}
		
		changeColumn.redraw();
	}
	
	/**
	 * Creates a new change ruler column for quick diff display independent of the 
	 * line number ruler column
	 * 
	 * @return a new change ruler column