D9951: [KUserProxy] Adjust to accounts service

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: Plasma.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.
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REVISION SUMMARY
  The avatar can also lie in the accounts service directory. Monitor there and also monitor for removal.
  Also in the handler check all paths we monitor rather than `faceIconPath` which might be empty due to the file having been removed.
  
  BUG: 384107

TEST PLAN
  - Created an avatar, showed up in Kickoff right away
  - Deleted an avatar, default icon showed up in Kickoff right away
  
  However, together with https://phabricator.kde.org/D9950 changing between avatars now throws ```QML Image: Error decoding: file:///var/lib/AccountsService/icons/kaiuwe: Dieser Typ von Bilddaten wird nicht unterstützt```. Oh ffs.

REPOSITORY
  R296 KDeclarative

REVISION DETAIL
  https://phabricator.kde.org/D9951

AFFECTED FILES
  src/qmlcontrols/kcoreaddons/kuserproxy.cpp

To: broulik, #plasma
Cc: plasma-devel, #frameworks, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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