eqn delimiters break conditionals

[наб <nabijaczleweli@nabijaczleweli.xyz>]

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Hi!

Consider the following file:
-- >8 --
.EQ
delim %%
.EN
.if 0 A % B % C
.if 1 D % E % F
-- >8 --

What'd you expect to see here? I'd expect D E F, with eqnified E,
and groff agrees:
-- >8 --
$ groff -e -Tutf8 < a.1 | grep -v '^$'
D E F
-- >8 --

However, mandoc (1.14.4-1 and latest CVS as of an hour ago) does not:
-- >8 --
$ ./mandoc < a.1 | grep -v '^$'
()                                                                          ()
 B C D E F
                                                                            ()
-- >8 --


Disabling eqn inline delimiters gives us the expected from both:
-- >8 --
$ cat a.1
.if 0 A % B % C
.if 1 D % E % F

$ groff -e -Tutf8 < a.1 | grep -v '^$'
D % E % F

$ ./mandoc < a.1 | grep -v '^$'
()                                                                          ()
D % E % F
                                                                            ()
-- >8 --


This smells like a bug to me, for reasons I assume obvious.

Best,
наб

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