Support the full range of variation selectors

* lisp/international/characters.el: Provide acronyms for variation
selectors.
(update-glyphless-char-display): Update display of the full range
of variation selectors.
(glyphless-char-display-control): Update doc string.  (Bug#57072)

* doc/lispref/display.texi (Glyphless Chars): Document more
variation selectors.

Copyright-paperwork-exempt: yes

2 files changed, 21 insertions, 8 deletions

diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index ace67fbedb7..96079dc106a 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -8596,9 +8596,9 @@ Characters of Unicode General Category [Cf], such as U+200E
 images, such as U+00AD @sc{soft hyphen}.
 
 @item variation-selectors
-Unicode VS-1 through VS-16 (U+FE00 through U+FE0F), which are used to
-select between different glyphs for the same codepoints (typically
-emojis).
+Unicode VS-1 through VS-256 (U+FE00 through U+FE0F and U+E0100 through
+U+E01EF), which are used to select between different glyphs for the same
+codepoints (typically emojis).
 
 @item no-font
 Characters for which there is no suitable font, or which cannot be
diff --git a/lisp/international/characters.el b/lisp/international/characters.el
index ca28222c815..d6e83c81e74 100644
--- a/lisp/international/characters.el
+++ b/lisp/international/characters.el
@@ -1525,6 +1525,17 @@ Setup `char-width-table' appropriate for non-CJK language environment."
   (aset char-acronym-table (+ #xE0021 i) (format " %c TAG" (+ 33 i))))
 (aset char-acronym-table #xE007F "->|TAG") ; CANCEL TAG
 
+(dotimes (i 256)
+  (let* ((vs-number (1+ i))
+         (codepoint (if (< i 16)
+                        (+ #xfe00 i)
+                      (+ #xe0100 i -16)))
+         (delimiter (cond ((<= vs-number 9) "0")
+                          ((<= vs-number 99) "")
+                          (t " "))))
+    (aset char-acronym-table codepoint
+          (format "VS%s%s" delimiter vs-number))))
+
 ;; We can't use the \N{name} things here, because this file is used
 ;; too early in the build process.
 (defvar bidi-control-characters
@@ -1574,7 +1585,9 @@ option `glyphless-char-display'."
                                              #x80 #x9F method))
             ((eq target 'variation-selectors)
              (glyphless-set-char-table-range glyphless-char-display
-                                             #xFE00 #xFE0F method))
+                                             #xFE00 #xFE0F method)
+             (glyphless-set-char-table-range glyphless-char-display
+                                             #xE0100 #xE01EF method))
             ((or (eq target 'format-control)
                  (eq target 'bidi-control))
              (when unicode-category-table
@@ -1647,10 +1660,10 @@ GROUP must be one of these symbols:
                     that are relevant for bidirectional formatting control,
                     like U+2069 (PDI) and U+202B (RLE).
   `variation-selectors':
-                    Characters in the range U+FE00..U+FE0F, used for
-                    selecting alternate glyph presentations, such as
-                    Emoji vs Text presentation, of the preceding
-                    character(s).
+                    Characters in the range U+FE00..U+FE0F and
+                    U+E0100..U+E01EF, used for selecting alternate glyph
+                    presentations, such as Emoji vs Text presentation, of
+                    the preceding character(s).
   `no-font':        For GUI frames, characters for which no suitable
                     font is found; for text-mode frames, characters
                     that cannot be encoded by `terminal-coding-system'.