This is actually related to bugreport #337353, where is indicated that almost all KF5 based applications lose their size and window position when closed and reopened. As indicated in comment#4, Martin Klapetek found out that this looks like setting a central widget (setCentralWidget()) on KXmlGuiWindow breaks restoring the size because of some code in QWidget. As that the real bug is reported for Dolphin, I am now entering a bug for frameworks-kxmlgui as that this seems to be the right place. Reproducible: Always Steps to Reproduce: 1. open dolphin 2. move the window arround, change its size, close dolphin 3. reopen again. it appears very small and forgets the size and position Actual Results: dolphin window appears small and out of position Expected Results: should keep its position and size This is not only the case with dolphin, but one could also test this with Okular, Okteta, etc
Forget about this one. I thought the other one was register in the wrong category