bug#56384: 29.0.50; backward-word doesn't move far enough in message-mode

[Sean Whitton]

Hello,

1. emacs -q
2. C-x m
3. foo>
4. C-b
5. M-b

Point does not move to the beginning of the line, as one would expect.

If a punctuation character other than '>' is used, it does to go bol.

-- 
Sean Whitton