[bug #46914] breaking behavior inconsistent within a .ce block

[Dave]

Follow-up Comment #15, bug #46914 (project groff):

[comment #14 comment #14:]
> The formatter has no conception of columns.  There is only a line length.

Yeah, I was speaking in shorthand, but apparently shortened too much.  By
"column" I meant it would calculate the center between the page offset +
indentation and the page offset + line length, in contrast to calculating the
center between the two page borders.  When there is one column and the margins
on both sides are the same, these come out to the same value.  Notably, -me's
default page layout (until the recent 
[http://git.savannah.gnu.org/cgit/groff.git/commit/?id=ac6e764a commit
ac6e764a]) had unequal margins, so the distinction mattered there.  And of
course any user can set up a single column of text with unequal margins,
whereupon groff not documenting how it defines the center becomes relevant.


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