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/AbstractJavaEditorTextHover.java
private IEditorPart fEditor;
	
	/*
	 * @see IJavaEditorTextHover#setEditor(IEditorPart)
	 */
	public void setEditor(IEditorPart editor) {
		fEditor= editor;
	}
	protected IEditorPart getEditor() {
		return fEditor;
	}
	protected ICodeAssist getCodeAssist() {
		if (fEditor != null) {