Dolphin can't copy files to a CIFS mount. It complains disk full. It also shows "Unknown size" on the lower right status bar. I'm pretty sure it's the same as this bug:https://bugs.kde.org/show_bug.cgi?id=334776A temporary fix involves copying two kio files over from 4.13.0. Might somebody be willing to look at post#20 in the thread linked above and help me to find the right two files from within our repositories in a safe way?
The patch from the bug report you linked has been included in the packaging, if everything is ok the problem should be gone with your next upgrade of kdelibs. please let me know if it persists.