[bug #65930] [me] large values of register `tv` cause infinite trap recursion

[G. Branden Robinson]

Follow-up Comment #4, bug #65930 (group groff):

[comment #3 comment #3:]
> [comment #2 comment #2:]
> > If I'm right about Allman not contemplating multi-line headers/footers
> 
> His "-me Reference Manual" explicitly addressed such things when talking
about the .$h (and, by reference, .$f) macro: "May be redefined to provide
fancy (e.g., multi-line) headers."

Ah.  I had forgotten, and didn't check.

> Intriguingly, "someone" has removed this text from the groff version of the
manual, perhaps in an attempt to hide his contemplation of such an
abomination.

<laugh>  It's not so abominable from our end, nor from his I think (as we
reused his code); since the `@t` internal macro is called by the `$h` and `$f`
"API" macros, it's the redefiner's responsibility to cope with the more
troublesome vertical spacing issues that arise.

I therefore see no need to put the vanished verbiage back; the leading `$` in
the macro names imply the needful.  (See the second-to-last paragraph on page
1 of _groff_'s _meref.me_.)

Or more simply:

"Go ahead and stick your fingers in, but be mindful of the teeth."


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