bug#38457: 27.0.50; dabbrev-expand regression due to message change

[Dmitry Gutov]

On 22.12.2019 0:03, Juri Linkov wrote:
> For compatibility with minibuffer-message this code was copied
> from minibuffer-message.  And indeed there is only one space
> between the minibuffer contents and the message.  If you see two spaces,
> maybe this is due to misconfiguration?

Seems you are right, sorry about that. I've pulled the latest master, 
rebuilt, and there are no extra spaces. Maybe it was caused by 
minimess.el in my init dir, IDK.

Here's something else to consider: if the user has resize-mini-windows 
set to nil, and the user has icomplete-mode on (for instance), the 
message might not be visible behind the (almost cut off) list of 
completions.

And even of resize-mini-windows has the default value, the message might 
appear so far from where the user is looking to be almost unnoticeable.

Should we try to reuse the area on the bottom-left's window mode-line? 
Like eldoc-minibuffer-message does.