Android notification icon
Currently, GNOME Shell uses a single bell icon to indicate new notifications. To make better use of this space, we could adopt a design similar to Android’s notification icons — displaying a compact list of up to 3 or 4 or 5 of the most recent app icons directly in the indicator area.
This approach minimalist enough for gnome’s taste while offering a more informative and intuitive preview of recent notifications. It allows users to quickly identify which apps have pending notifications without needing to open the message tray. also maybe a single dot at the end to indicate that there are more notifications in case it is greater than the maximum I mentioned above.
It is actually easy to implement, just small restructure in the internal MessageIndicator class