It would be very helpful if GoSub and Goto included mentioning that they set A_ThisLabel or A_ThisLabel is added to the these command's "RELATED" section.
Additionally, GUI g-label states
To this list should also be added A_This_Label.The subroutine may consult the following built-in variables: A_Gui, A_GuiControl, A_GuiEvent, and A_EventInfo.