Broadcast window now shows all groups with online and offline contacts, plus it shows Offline group. So if you want to send a broadcast to online users only, you would have two options:
1. Check Roster checkbox, then uncheck offline users in every group one by one and uncheck Offline group. (this will take some time with a large roster)
2. Check only online users in every group one by one (time consumable either)
Maybe Broadcast window should obey roster settings (like Show empy groups, Offline contacts grouping,
SPARK-928, etc.) or maybe it should have appropriate checkboxes in broadcast window. Like:
1. Check all online users.
2. Check all offline users.
3. Do not show Offline group.