[var-width fonts] indent.c `string_display_width'

[Thien-Thi Nguyen]

this is `#if 0' presently.  it shares structure w/ `current_column' (and
`current_column_1') and was added in 1995 (indent.c,v1.56).

i guess the original approach was to try to use it as a basis for
`current_column' and `current_column_1'.  the current task (making
column a float) presents a good time to do this merge.  what do you
think?

(cc emacs-devel -- are you on that list?)

thi