Interesting ... I'm writing a message at the moment.
This one has no bullets. Just a quote to start the message.
And in the preview, there's that scrollbar again ... I'll show the entire width this time ...
As far as I can remember, I just started typing straight after the quote -- didn't notice whether it was indented at the time so it may have happened immediately, or being triggered by something I did later.
Trying to reproduce it again ...
- I notice it's not possible to even try to repeat it exactly. After posting a reply conaining a quote, I no longer get the ability to quote from that same message
- So I tried quoting from the another message in the same thread. No indentation occurred.
So, still need to sort out what might trigger it ?