Downstream bug: https://bugzilla.redhat.com/show_bug.cgi?id=1684190 (ristretto:13795): GLib-CRITICAL **: 16:29:30.867: Source ID 33 was not found when attempting to remove it Seems to happen on resizing the ristretto window.
Thanks Kevin! I can reproduce this.
Igor referenced this bugreport in commit b2e6b0563bf04ec68b11aea5761cd9d5f8578f31 Fix Glib-Critical errors to stdout https://git.xfce.org/apps/ristretto/commit?id=b2e6b0563bf04ec68b11aea5761cd9d5f8578f31