Package changes:
+signal-desktop 1.34.1 amd64
image/x-srf; shotwell %s; test=test -n "$DISPLAY"
image/x-x3f; shotwell %s; test=test -n "$DISPLAY"
x-content/image-dcf; shotwell %s; test=test -n "$DISPLAY"
+x-scheme-handler/sgnl; /opt/Signal/signal-desktop --no-sandbox %s; test=test -n "$DISPLAY"
x-scheme-handler/snap; /usr/bin/snap handle-link %s; test=test -n "$DISPLAY"
x-scheme-handler/steam; steam steam://open/friends %s; test=test -n "$DISPLAY"
x-scheme-handler/msteams; /usr/bin/teams --quit %s; test=test -n "$DISPLAY"