Bug 40787 [plan item] Affordance for F2 opportunity in Java editor
There should be a small label explaining that F2 pins the hover.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/java/hover/SourceViewerInformationControl.java
/*
	 * @see IInformationControl#setVisible(boolean)
	 */
	public void setVisible(boolean visible) {
			fShell.setVisible(visible);
	}
	
	/*
	 * @see IInformationControl#dispose()
	 */
	public void dispose() {
		if (fShell != null) {
			if (!fShell.isDisposed())
				fShell.dispose();
			fShell= null;
			fText= null;
		}
	}
	
	/*
	 * @see IInformationControl#setSize(int, int)
	 */
	public void setSize(int width, int height) {
		fShell.setSize(width, height);
	}
	
	/*
	 * @see IInformationControl#setLocation(Point)
	 */