Fix display of 'parts' of sequences in the sequence column.

When relying on aliasing, a number of single character emoji can be
replaced by sequence emoji (in particular, gendered variants).  If
these images aren't present, the current code that displays a sequence
'visually' fails to find an image for one of the parts, so bails and
there's no visual presentation for those sequences.

To fix this, we first canonicalize the part we're looking for, and try
to find an image for that, and if we fail we check for an alias and
try to find an image for that.

generate_emoji_html.py

@@ -87,16 +87,30 @@ def _generate_row_cells(key, font, aliases, dir_infos, basepaths, colors):
   return row_cells
 
 
-def _get_desc(key_tuple, dir_infos, basepaths):
+def _get_desc(key_tuple, aliases, dir_infos, basepaths):
   CELL_PREFIX = '<td>'
   def _get_filepath(cp):
+    def get_key_filepath(key):
+      for i in range(len(dir_infos)):
+        info = dir_infos[i]
+        if key in info.filemap:
+          basepath = basepaths[i]
+          return path.join(basepath, info.filemap[key])
+      return None
+
     cp_key = tuple([cp])
-    for i in range(len(dir_infos)):
-      info = dir_infos[i]
-      if cp_key in info.filemap:
-        basepath = basepaths[i]
-        return path.join(basepath, info.filemap[cp_key])
-    return None
+    cp_key = unicode_data.get_canonical_emoji_sequence(cp_key) or cp_key
+    fp = get_key_filepath(cp_key)
+    if not fp:
+      if cp_key in aliases:
+        fp = get_key_filepath(aliases[cp_key])
+      else:
+        print 'no alias for %s' % unicode_data.seq_to_string(cp_key)
+    if not fp:
+      print 'no part for %s in %s' % (
+          unicode_data.seq_to_string(cp_key),
+          unicode_data.seq_to_string(key_tuple))
+    return fp
 
   def _get_part(cp):
     if cp == 0x200d:  # zwj, common so replace with '+'
@@ -236,7 +250,7 @@ def _generate_content(
 
   for key in keys:
     row = _generate_row_cells(key, font, aliases, dir_infos, basepaths, colors)
-    row.append(_get_desc(key, dir_infos, basepaths))
+    row.append(_get_desc(key, aliases, dir_infos, basepaths))
     row.append(_get_name(key, annotations))
     lines.append(''.join(row))