[Pharo-dev] Improve "Senders of"

Hi, I tried to improve the “senders of” behaviour in the case where you just put a selector (e.g. in the playground). needs some testing: https://pharo.fogbugz.com/f/cases/21251/Improve-Senders-of <https://pharo.fogbugz.com/f/cases/21251/Improve-Senders-of> https://github.com/pharo-project/pharo/pull/810 <https://github.com/pharo-project/pharo/pull/810> Marcus