[Groff] unicode support, part 12: \(la, \(ra

[Bruno Haible]

Since the question about \[la] and \[ra] will certainly be asked again,
I propose to add a comment about it. (Only in glyphuni.cpp, since there
doesn't appear to be a way to add a comment to devhtml/R.proto.)

diff -r -c3 groff-20060217.orig/src/libs/libgroff/glyphuni.cpp 
groff-20060217/src/libs/libgroff/glyphuni.cpp
--- groff-20060217.orig/src/libs/libgroff/glyphuni.cpp  2006-02-19 
19:57:41.000000000 +0100
+++ groff-20060217/src/libs/libgroff/glyphuni.cpp       2006-02-20 
00:25:09.000000000 +0100
@@ -484,6 +484,14 @@
   { "HE", "2665" },
   { "DI", "2666" },
   { "OK", "2713" },
+  // The "left angle bracket" and "right angle bracket" could be mapped to
+  // either U+2329,U+232A or U+3008,U+3009 or U+27E8,U+27E9. But the first
+  // and second possibility are double-width characters (see Unicode's
+  // DerivedEastAsianWidth.txt file) and are therefore not suitable for
+  // general use, whereas the third possibility is single-width.
+  // The devhtml device overrides this mapping, because
+  //   http://www.w3.org/TR/html401/sgml/entities.html
+  // says that in HTML, ⟨ and ⟩ are U+2329,U+232A, respectively.
   { "la", "27E8" },
   { "ra", "27E9" },
 };