Add notification-count, highligh and has-notifications properties to the sidebar section model and signal on corresponding changes. Aggregation is done as follows: notification-count := sum_over_rooms_in_section(notification-count) highligh := union_over_rooms_in_section(highligh) has-notification := any_over_rooms(has-notifications)

Functionality of ExpressionList is reused on one of the intermediate models to populate watches (internally on the underlying model) and signal change of notification-count or highlight with the room indices. This implementation recalculates the aggregate expressions via naive iterations (discarding exactly which room(s)' values were changed).

UI state bits are reflected accordingly to consume the signalled changes.

Fixes: #1048

In reply to @intelfx:intelfx.name
Hey. Are there known problems with media fetching from Fractal? I can't see any avatars, icons, or any other media shared in rooms.

This also upgrades the SDK which results in a few other changes.

From what I can see with version 10.1 from Flathub, this app doesn't show a "What's New" page button in its About dialog. LibAdwaita offers a convenience function for this, to show the app's release notes: https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/property.AboutDialog.release-notes.html

Apps that already implement this include: Shortwave, Showtime, stable releases of GNOME Calendar, Papers, GNOME System Monitor, Decibels, Warp, etc.

Fractal has major improvements in every release, so it would be neat to give them an additional venue where the improvements can be discovered.

If the window is too narrow, the search entry moves below the servers button.

Closes #1267+.