Consider https://community.giffgaff.com/d/33099905-do-you-keep-both-goodybag-credit-on-your-account as a good example of this problem, but it's a problem that happens in other threads too -- and probably in all threads, depending on circumstamces.
In that thread, I can be replying to some other member. Within my reply, I want to @ mention the thread originator (OP), who has not replied in the previous 10 threads
The unexepected behaviour:
I start typing @rikk and about that time, the OP's name flashes up briefly, to be very quickly replaced by a list of other members whose names begin with @rikk. But there are too many other matching members for the dropdown and rikka_gg is not one of them. So I cannot pick hers from the list
Suggested improvement:
When there are too many matches, the picklist should give priority to members that have posted in the thread, and after that to the names of giffgaff staff. Members who have not contributed to the thread should only be shown at the bottom of the list, if space allows.
The bug
Even if I type in @rikka_gg in full, it seems that because I didn't select it from the dropdown, in the compose window and even in my preview it doesn't actually show up as an @mention.
