D4665: Fix project tree state not being saved

[Janek Bevendorff]

bevendorff added a dependent revision: D6019: Follow-up patch for D4665 (bug #379433)..

REPOSITORY
  R33 KDevPlatform

REVISION DETAIL
  https://phabricator.kde.org/D4665

To: bevendorff, mwolff, apol, flherne, kfunk
Cc: flherne, kfunk, kdevelop-devel
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