[Differential] [Request, 20 lines] D3313: Return a reference to AppData instead of the whole tuple

[apol (Aleix Pol Gonzalez)]

apol created this revision.
apol added reviewers: Plasma, hein.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  This way we can use Private::appData(WId) for modifying the cache values
  Doesn't imply a copy every time we access it (it's not a CoW class)
  
  Cache window icon

REPOSITORY
  rPLASMAWORKSPACE Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D3313

AFFECTED FILES
  libtaskmanager/xwindowtasksmodel.cpp

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To: apol, #plasma, hein
Cc: plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas
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