Description of problem: In the new Fedora version the client does not start in the Tray/somewhere else, but shows the window directly at startup. How reproducible: Always. Steps to Reproduce: 1. Use Fedora 26, enable autostart in the settings. 2.- Upgrade to Fedora 27. Actual results: Shows window at startup. Expected results: Start minimized.
Since there is not system tray any more there is also no way of opening GUI after closing to background...
What desktop environment are you using?
GNOME, yes you are right. Adding topicons plus helps (as a workaround). Also reported to upstream (https://github.com/nextcloud/gsoc_client/issues/18) as they already have a working implementation (see https://blog.juliushaertl.de/index.php/2017/05/18/gsoc-2017-gnome-and-nextcloud/) implemented in their GSOC project. It's just not merged yet.
So it looks like we only can wait for upstream to merge such improvements into a stable release