[bug #64860] [eqn] characters in accent should be set in roman

[Pim]

URL:
  <https://savannah.gnu.org/bugs/?64860>

                 Summary: [eqn] characters in accent should be set in roman
                   Group: GNU roff
               Submitter: pim
               Submitted: Sun 05 Nov 2023 01:50:20 PM UTC
                Category: Preprocessor eqn
                Severity: 3 - Normal
              Item Group: Rendering/Cosmetics
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Sun 05 Nov 2023 01:50:20 PM UTC By: Pim <pim>
As [https://lists.gnu.org/archive/html/groff/2023-06/msg00143.html noticed in
June this year], the tilde and utilde accent in eqn are shifted too far to the
right on base characters in the (default) italic font, while others like hat
are typeset correctly, and so are tilde and utilde too if the base letter was
set in roman.

The problem lies in the definition of the tilde and utilde keywords in
lex.cpp; while the definition of hat explicitly changes the typeface to roman
for the ^, this is not done for tilde and utilde. Incidentally, the man page
of eqn makes the same mistake, by providing as an example the definition of
the hat keyword, but omitting the roman keyword.

The following patch fixes those problems:

 diff -r -u orig/groff-1.23.0/src/preproc/eqn/eqn.1.man
groff-1.23.0/src/preproc/eqn/eqn.1.man
--- orig/groff-1.23.0/src/preproc/eqn/eqn.1.man 2023-07-02 18:09:34.000000002
+0200
+++ groff-1.23.0/src/preproc/eqn/eqn.1.man      2023-11-05 14:45:16.000000002
+0100
@@ -637,7 +637,7 @@
 .RS
 .IP
 .EX
-accent { "\[ha]" }
+accent { roman "\[ha]" }
 .EE
 .RE
 .
diff -r -u orig/groff-1.23.0/src/preproc/eqn/lex.cpp
groff-1.23.0/src/preproc/eqn/lex.cpp
--- orig/groff-1.23.0/src/preproc/eqn/lex.cpp   2023-07-02 18:09:34.000000002
+0200
+++ groff-1.23.0/src/preproc/eqn/lex.cpp        2023-11-05 14:38:46.000000002 
+0100
@@ -222,7 +222,7 @@
   { "half", "{1 smallover 2}" },
   { "hat_def", "roman \"^\"" },
   { "hat", "accent { hat_def }" },
-  { "tilde_def", "\"~\"" },
+  { "tilde_def", "roman \"~\"" },
   { "tilde", "accent { tilde_def }" },
   { "==", "type \"relation\" \\(==" },
   { "!=", "type \"relation\" \\(!=" },
@@ -251,7 +251,7 @@
   { "dot", "accent { dot_def }" },
   { "dotdot_def", "up 52 back 25 \"..\"" },
   { "dotdot", "accent { dotdot_def }" },
-  { "utilde_def", "down 75 \"~\"" },
+  { "utilde_def", "down 75 roman \"~\"" },
   { "utilde", "uaccent { utilde_def }" },
   { "vec_def", "up 52 size -5 \\(->" },
   { "vec", "accent { vec_def }" },









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