Falkon works as supposed if not in fullscreen mode but once in fullscreen it won't show up bookmarks/history completion I can still cycle through them with tab/arrows. Debian unstable: https://github.com/lyr3/dots/blob/b89e45a334317490dd8564db4c9254df755e9570/home/.config/scripts/falkon_install
Works here, what is your window manager?
(In reply to David Rosca from comment #1) > Works here, what is your window manager? Interesting question. DWM!
Can you test with different wm, eg. openbox?
(In reply to David Rosca from comment #3) > Can you test with different wm, eg. openbox? Yep. Completion is working on i3wm! Sorry, my good sir!
Wow it is working now on Dwm too. Weird!