The latest version of QT5 on Fedora 27 – qt5-qtbase-5.9.6-1.fc27.x86_64 – produces a very annoying display problem in KDE’s Dolphin file manager, where the window does not resize/reformat correctly, leaving large blank areas at each side:

Dolphin window problem..

This has been identified as a QT5 bug/regression, and a patch is available, at https://codereview.qt-project.org/#/c/233482/

I have applied this, and Dolphin now behaves correctly, again.   QT5 5.10.1-6 on Fedora 28 does not have this problem, but that update is not – yet – available for Fedora 27.

Robert Gadsdon.   June 27, 2018.