Bug 53010 Editor preferences do not take effect on open editors
I-20040224 Go to the Java > Editor > Syntax preference page. Change the keyword color to red. Press Ok. At this point, we use to see the preview update. Not on this build (problem #1). Press Ok, and close the pref dialog. The java editor that was already open did not update. I had to close it and reopen it for the colors to take effect (problem #2)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
public void doubleClick(DoubleClickEvent event) {
				
				triggerAction(ITextEditorActionConstants.RULER_DOUBLE_CLICK);
}
			private void triggerAction(String actionID) {
				IAction action= getAction(actionID);
				if (action != null) {
					if (action instanceof IUpdate)
						((IUpdate) action).update();
					
					if (action instanceof ISelectionListener) {
						((ISelectionListener)action).selectionChanged(null, null);
					}
					if (action.isEnabled())
						action.run();
				}
			}
			
		}, getAnnotationAccess()));
		ruler.addDecorator(0, column);
		
		if (isLineNumberRulerVisible())
			ruler.addDecorator(1, createLineNumberRulerColumn());
		else if (isPrefQuickDiffAlwaysOn())
			ruler.addDecorator(1, createChangeRulerColumn());
		
		return ruler;
	}
	
}