protected void updateNavigatable(ActionContext context) {
		if (dialog == null) {
			return;
		}
		if (context instanceof NavigatableActionContext) {
			dialog.setNavigatable(((NavigatableActionContext) context).getNavigatable());
		}
		else {
			dialog.setNavigatable(null);
		}
	}
This plugin class contains the structure needed for the user to
select blocks of data anywhere inside of the Code Browser and Byte Viewer.
<p>
Note:  This plugin used to refer to selections as blocks instead of lengths
of bytes.  The GUI has been changed, but the internal comments and 
variable names have not.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/select/SelectBlockPlugin.java