D6529: KDevelop::MainWindow: use setWindowFilePath()

[Kevin Funk]

kfunk added a comment.


  Backported to 5.1 -- this patch is trivial enough.
  
  I also fixed up your last commit. Doing `setWindowFilePath({})` in the else-branch could still leave you with an outdated windowFilePath set. I.e. in case there's an active view but no `UrlDocument*`.

REPOSITORY
  R33 KDevPlatform

REVISION DETAIL
  https://phabricator.kde.org/D6529

To: rjvbb, #kdevelop, kfunk
Cc: kfunk, kdevelop-devel, kde-mac, geetamc, Pilzschaf, akshaydeo, surgenight, arrowdodger
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