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/text/java/hover/JavaTextHover.java
return getInformation(textViewer, hoverRegion);
	}
	
	/*
	 * @see IInformationProvider#getSubject(ITextViewer, int)
	 */
	public IRegion getSubject(ITextViewer textViewer, int offset) {
		
		if (!fEnabled)
			return null;
		
		if (textViewer != null)
			return JavaWordFinder.findWord(textViewer.getDocument(), offset);
		
		return null;	
	}
	/*
	 * @see IInformationProvider#getInformation(ITextViewer, IRegion)
	 */
	public String getInformation(ITextViewer textViewer, IRegion subject) {
		if (fImplementations != null && fEnabled) {
			for (int i= 0; i < fImplementations.length; i++) {
				String s= fImplementations[i].getHoverInfo(textViewer, subject);
				if (s != null && s.trim().length() > 0)
					return s;
			}
		}
		return null;
	}
}