There's a bug in `vertical-motion' which will cause it to move the
point not to the beginning of the next (visual) line when called with
argument 1, but just a few characters to the right in the current
line. This occurs iff there is a Tab in the line, as illustrated by
the two screenshots attached.
The first screenshot shows the point at the leftmost character in the
second visual line of a wrapped line. (could be a few characters to
the right.)
Then we call (vertical-motion 1). The point doesn't move to where it
should (see screenshot 2).
Another call to (vertical-motion 1) finally moves the cursor to the
right position.
To reproduce, take a scratch buffer, enter a few lines of text wich
will be wrapped and contain one (or more?) tabs. Place cursor near
the end of a wrapped line, but not too far towards the end, and call
M-: (vertical-motion 1).
Tried this in Aquamacs (based on very recent GNU CVS) and as well
with a vanilla CVS build (Carbon port on OS X) with a fixed-width font.
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