Operating system: Linux-5.1.12-300.fc30.x86_64-x86_64-with-fedora-30-Thirty 64 Bits
Graphics card: Mesa DRI Intel(R) Ivybridge Mobile Intel Open Source Technology Center 4.2 (Core Profile) Mesa 19.0.6
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-06-24 18:46, hash: rBc0c1b4542f39
Short description of error
Toggle Window Fullscreen crashes Blender (and machine!) under Fedora 30! Using the menubar to switch to Window Fullscreen works, coming back, not so much, Blender disappears, nowhere to be seen and the fans of the computer come on hard. If a Terminal window was open it can be seen that Blender is still active and is increasingly using up CPU, until the entire machine locks up. The same problem does not occur under Ubuntu 18.04.2 LTS
Exact steps for others to reproduce the error
Just launch Blender, go to the Window-menu up top and select "Toggle Window Fullscreen". After a few seconds select the function again after which Blender seems to disappear.