patch 9.1.1570: Copilot suggested some improvements in cmdexpand.c

Problem:  Copilot suggested some improvements in cmdexpand.c
          (after v9.1.1556)
Solution: Use better variable names and comments
          (John Marriott).

closes: #17795

Signed-off-by: John Marriott <basilisk@internode.on.net>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/cmdexpand.c

@@ -3718,8 +3718,9 @@ ExpandGenericExt(
  */
     static void
 expand_shellcmd_onedir(
-	char_u		*pat,
+	char_u		*pathed_pattern,    // fully pathed pattern
-	size_t		pathlen,	// length of the path portion of pat.
+	size_t		pathlen,	    // length of the path portion of pathed_pattern
+					    // (0 if no path).
 	char_u		***matches,
 	int		*numMatches,
 	int		flags,
@@ -3727,7 +3728,7 @@ expand_shellcmd_onedir(
 	garray_T	*gap)
 {
     // Expand matches in one directory of $PATH.
-    if (expand_wildcards(1, &pat, numMatches, matches, flags) != OK)
+    if (expand_wildcards(1, &pathed_pattern, numMatches, matches, flags) != OK)
 	return;
 
     if (ga_grow(gap, *numMatches) == FAIL)
@@ -3878,6 +3879,9 @@ expand_shellcmd(
 	    seplen = !after_pathsep(s, e) ? STRLEN_LITERAL(PATHSEPSTR) : 0;
 	}
 
+	// Make sure that the pathed pattern (ie the path and pattern concatenated
+	// together) will fit inside the buffer. If not skip it and move on to the
+	// next path.
 	if (pathlen + seplen + patlen + 1 <= MAXPATHL)
 	{
 	    if (pathlen > 0)

src/version.c

@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1570,
 /**/
     1569,
 /**/