D7204: Use cached version isDir()

[David Edmundson]

davidedmundson abandoned this revision.

REPOSITORY
  R119 Plasma Desktop

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

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