gwenview is unusable on Gnome 3.22.2 (Arch) because the problem shown on the screencast.
screencast link https://www.youtube.com/watch?v=wOFHw68B4Wc
Holy schamoley that looks crazy! Any chance you can try to reproduce it with GNOME 3.24 or 3.26 and a more recent version of Gwenview?
Created attachment 108767 [details] Gwenview 17.08.3 Sure. Gwenview 17.08.3 installed today on Arch, Gnome 3.26.2.
Yikes, that's just terrible.
Cannot reproduce on Arch Linux running Gnome 3.32 (Wayland) + gwenview 18.12.3 + Qt 5.12.2.