fix: make derived notifiers detach on last listener removals - #2

fix: make derived notifiers detach on last listener removals#2

Feichtmeier wants to merge 2 commits into

flutter-it:mainflutter-it/listen_it:mainfrom

Feichtmeier:fix/derived_notifier_detachFeichtmeier/listen_it:fix/derived_notifier_detachCopy head branch name to clipboard