Previously, inserting a bulleted or numbered list via the compose
box added an extra blank line before and after the list.
This commit removes the extra blank line inserted before the list.
Fixes#32607.
Forward message starts a new message with the quoted context
(message or selection).
The compose box opens with then channel picker open and no topic.
Also added documentation about this feature in the help center.
Fixes part 2 of #31953