bug#6192: 24.0.50; eldoc-mode: unexpected recentering

[martin rudalics]

> I don't know, but I stepped through eldoc.el with Edebug and when it got
> to the point where the message is put into the echo area, this is what
> it showed:
>
> Result: #("let: (VARLIST BODY...)" 0 3 (face font-lock-function-name-face) 14 
21 (face eldoc-highlight-function-argument))
>
> This string made the echo area expand to two lines, but in normal
> (non-edebug) execution it of course shows up just as "let: (VARLIST
> BODY...)" (with fontification).  So if the propertized string is the
> source of the expanded echo area, the question becomes why it does not
> shrink again.  (And there's still the question of why this only happens
> when eldoc-mode is enabled in my init file...)

I had some problem with eldoc-mode after the latest greater bunch of
changes.  There was some bold face that caused my echo area occupy two
lines occasionally.  IIRC customizing `eldoc-highlight-function-argument'
and/or `eldoc-highlight-unsupplied-argument' to something non-bold
solved the problem for me.

martin