D7204: Use cached version isDir()

[David Edmundson]

davidedmundson created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  Micro-optimisation.
  
  model.isDir() does a full stat of a file.
  We hover a lot, may as well use a cached version of the variable.
  
  CCBUG: 379994

REPOSITORY
  R119 Plasma Desktop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7204

AFFECTED FILES
  containments/desktop/package/contents/ui/FolderItemDelegate.qml

To: davidedmundson
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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