public B popupMenuGroup(String group) {
		popupGroup = group;
		return self();
	}
Sets the group for the action in the pop-up menu.  Actions in the same group will appear
next to other actions in the same group and actions in different groups will be separated
by menu dividers.

@param group for this action
@return this builder (for chaining)
Ghidra/Framework/Docking/src/main/java/docking/action/builder/AbstractActionBuilder.java