When I edit an alias, the message in the edit summary, that appears in the history/watchlist is: "Updated [language] alias", and then the old alias. For more clarity, it should probably show the new alias that has been entered.
Tested here: I changed the French alias from "Bac à Sable (7rkujizi)" to "test" and the message appearing in the edit summary is the previous alias.
Requested by the community here
Change 430609 had a related patch set uploaded (by Ladsgroup; owner: Amir Sarabadani):
[mediawiki/extensions/Wikibase@master] Make wbsetaliases API use new aliases instead of the old ones in summary
Change 432064 had a related patch set uploaded (by WMDE-leszek; owner: WMDE-leszek):
[mediawiki/extensions/Wikibase@master] Added tests for summary of edits made by wbsetaliases API
Change 432065 had a related patch set uploaded (by WMDE-leszek; owner: WMDE-leszek):
[mediawiki/extensions/Wikibase@master] wbsetaliases: when changing aliases, include post-edit aliases in the summary
Change 430609 abandoned by Ladsgroup:
Make wbsetaliases API use new aliases instead of the old ones in summary
Change 432064 merged by jenkins-bot:
[mediawiki/extensions/Wikibase@master] Added tests for summary of edits made by wbsetaliases API
Change 432065 merged by jenkins-bot:
[mediawiki/extensions/Wikibase@master] wbsetaliases: when changing aliases, include post-edit aliases in the summary
This still seems to have the wrong behaviour :/
https://test.wikidata.org/w/index.php?title=Q60867&diff=379861&oldid=379860
Nevermind. Working on https://wikidata.beta.wmflabs.org/w/index.php?title=Q458254&diff=1006082&oldid=1006081 now \o/ Will be rolled out with the next train.