[groff] [patch] modernize -T ascii rendering of opening single quote

[Ingo Schwarze]

Hi,

i just submitted the following patch to the groff bugtracker:

  https://savannah.gnu.org/bugs/index.php?55616

The (identical) rationale and patch are reproduced below for
convenience.

I'm posting this heads-up just in case anybody wants to raise a concern
that i overlooked.  Of course, OKs for commit are welcome, too (i'll
of course do a ChangeLog entry when committing, but i wanted to keep
the patch simple for review).

Yours,
  Ingo


 ----- 8< ----- schnipp ----- >8 ----- 8< ----- schnapp ----- >8 -----

If i remember correctly, some time ago, people went through error
messages and manual pages and changed single-quoted strings where
the opening quote was an "accent grave" to the normal ASCII U+0027
APOSTROPHE-QUOTE because rendering single quotes like `this' was
considered an anachronism from the mechanical typewriter era.

However, the -T ascii output device still renders \(oq as "accent
grave", also affecting macro packages that implement single quoting
macros in terms of \(oq, for example mdoc(7) .Sq.

I propose the patch below to change the -T ascii (and -T latin1)
rendering of \(oq from "accent grave" to APOSTROPHE-QUOTE. No other
output device is affected.

For example, this makes -Tascii-rendered manual pages look less
antique, and if this is decided, i will do the same in mandoc(1).
However, i think it's also the right thing to do for non-manual-page
documents.

Issue brought up by Anthony Bentley@ (OpenBSD).

 ----- 8< ----- schnipp ----- >8 ----- 8< ----- schnapp ----- >8 -----

diff --git a/font/devascii/R.proto b/font/devascii/R.proto
index 7144dae5..abb3a594 100644
--- a/font/devascii/R.proto
+++ b/font/devascii/R.proto
@@ -48,8 +48,9 @@ Do    "
 '      24      0       0047
 aa     "
 fm     "
 aq     "
+oq     "
 cq     "
 (      24      0       0050
 )      24      0       0051
 *      24      0       0052
@@ -142,9 +143,8 @@ ha  "
 _      24      0       0137
 ru     "
 ul     "
 `      24      0       0140
-oq     "
 ga     "
 a      24      0       0141
 b      24      0       0142
 c      24      0       0143
diff --git a/font/devlatin1/R.proto b/font/devlatin1/R.proto
index ff333563..a8d093a1 100644
--- a/font/devlatin1/R.proto
+++ b/font/devlatin1/R.proto
@@ -47,8 +47,9 @@ Do    "
 &      24      0       0046
 '      24      0       0047
 fm     "
 aq     "
+oq     "
 cq     "
 (      24      0       0050
 )      24      0       0051
 *      24      0       0052
@@ -141,9 +142,8 @@ ha  "
 _      24      0       0137
 ru     "
 ul     "
 `      24      0       0140
-oq     "
 ga     "
 a      24      0       0141
 b      24      0       0142
 c      24      0       0143