private void viewRemoved(Component view, URL url, boolean notify) {
		removeViewPanel(url);

		// remove the component from the tabbed pane
		readOnlyTab.remove(view);
		((ProjectDataTreePanel) view).dispose();

		// if we have no more views, hide the read-only tabbed pane
		if (readOnlyViews.size() == 0) {
			setViewsVisible(false);
		}
		tool.getProject().removeProjectView(url);
		validate();
	}
returns the ProjectURL for the current active view; null if no views open
@return the ProjectURL for the current active view; null if no views open
Ghidra/Framework/Project/src/main/java/ghidra/framework/main/ProjectDataPanel.java