A single Right-arrow press skipped 1,676 tracks in 81 s and hard-froze the
desktop. On Wayland key repeat is generated by the client until the
compositor delivers the release, and the key filter treated every repeat as
a new press. Each skip sent gnome-shell an MPRIS Metadata whose xesam:artist
was a plain Python list, which marshals as "av" instead of "as". gnome-shell
logged an error for every one (50k/min) and reloaded the cover, and that load
is what kept it from ever delivering the release.
Space/Left/Right now act once per press and swallow the repeats.
xesam:artist goes out through mpris.string_array, which build_properties_changed
now shares for invalidated_properties. The new test round-trips the signal
into GDBus, which is what gnome-shell validates with, and fails 'av' == 'as'
against the old code.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
