public SourceTagsPanel getSourcePanel() {
		return sourcePanel;
	}
Updates the button panel depending on the selection state of the
tag lists. Also updates the {@link AllFunctionsPanel} so it can update
its list.

@param panel the panel that generated the selection event
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/function/tags/FunctionTagProvider.java