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:
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.