This appears to be a bug in xsel (with a fix pending at https://github.com/kfish/xsel/pull/1), _and_ a bug in Gtk+ ("Should GTK+ protect itself against selection windows disappearing? Most likely, yes.").
This appears to be a bug in xsel (with a fix pending at https:/ /github. com/kfish/ xsel/pull/ 1), _and_ a bug in Gtk+ ("Should GTK+ protect itself against selection windows disappearing? Most likely, yes.").