[bug #62191] [tbl] use of line continuation throws off input line counter

[G. Branden Robinson]

Follow-up Comment #2, bug #62191 (project groff):

Let's see if this problem occurs in other preprocessors.

* eqn: apparently not; you don't need '\' to perform line continuation and in
fact attempting to do so provokes an error.

* grn: also does not admit line continuation.

* (pre-)html: doesn't even appear to read input files by line.
https://git.savannah.gnu.org/cgit/groff.git/tree/src/preproc/html/pre-html.cpp#n495

* pic: as eqn.

* refer: does not treat '\newline' specially.

* soelim: does not treat '\newline' specially.

Experiments also reveal that eqn, refer, and soelim report accurate
diagnostics when encountering trouble after one of their respective "regions".


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