PresenterWidget#internalAddToSlot always call performReset

[ibaca]

This is a bit weird in some cases, for example, each time you use the popup-slot it will reset the whole hierarchy starting at the presenter used to reveal the slot, so if you add popups to the root presenter, then you reset the whole hierarchy.

What is the purpose of the rest? Define it.

Once defined. Review if resetting the presenter hierarchy makes sense each time you show a popup.