Paint Select GIMP 2.99.14 switching between add and subtract

GIMP 2.99.14 / flatpak / Ubuntu 20.04

There is no keyboard shortcut to switch between addition and subtraction, something like holding Ctrl or Shift to switch between add/sub > like there is with the other select tool AKA fuzzy, color select and so,

thus we do need to go on the tool options dialog each time we made a mistake.

Sorry for that screenshot, I was toying around with this very picture as I just activated this tool, the paint select seems to work nicely, though ;)