53f61f3778
X11 window stacking operations are by nature prone to race conditions. For example, we might queue a "raise above" operation, but before it actually takes place, the sibling the window was to be rased above, is withdrawn. In these cases we'd log warnings even though they are expected to happen. Downgrade these warnings to debug messages, only printed when MUTTER_VERBOSE is set. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1300