@Override
	public ActionContext getActionContext(MouseEvent event) {
		ActionContext context = super.getActionContext(event);
		if (context != null) {
			return context;
		}

		ActionContext actionContext = new DefaultActionContext(null, this, event.getComponent());
		actionContext.setMouseEvent(event);

		return actionContext;
	}
Return the selected version number from the history panel.
@return -1 if a version history was not selected
Ghidra/Features/Base/src/main/java/ghidra/framework/main/OpenVersionedFileDialog.java