Bug 4369 F2 should work even if "Hide Text Hover" is enabled
- enable "Hide Text Hover" - position the cursor on a type - press F2 observe: nothing happens although I explicitly requested JavaDoc help.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
if (fBracketHighlighter != null)
					fBracketHighlighter.setHighlightColor(getColor(MATCHING_BRACKETS_COLOR));
				return;
			} 
			
			InternalSourceViewer isv= (InternalSourceViewer) getSourceViewer();
			IContentAssistant c= isv.getContentAssistant();
			if (c instanceof ContentAssistant)
				ContentAssistPreference.changeConfiguration((ContentAssistant) c, getPreferenceStore(), event);
				
		} finally {
			super.handlePreferenceStoreChanged(event);
		}
	}
	/*
	 * @see AbstractTextEditor#affectsTextPresentation(PropertyChangeEvent)
	 */
	protected boolean affectsTextPresentation(PropertyChangeEvent event) {
		String p= event.getProperty();
		boolean affects=MATCHING_BRACKETS_COLOR.equals(p);
		return affects ? affects : super.affectsTextPresentation(event);
	}
	
	/*
	 * @see AbstractTextEditor#createSourceViewer(Composite, IVerticalRuler, int)
	 */
	protected ISourceViewer createSourceViewer(Composite parent, IVerticalRuler ruler, int styles) {
		return new InternalSourceViewer(parent, ruler, styles);
	}
}