patch 8.2.2164: Vim9: autoload function doesn't work in uppercased script

Problem:    Vim9: autoload function doesn't work in script that starts with
            an upper case letter.
Solution:   Check for the autoload character. (closes #7502)

src/testdir/test_vim9_script.vim

@@ -2799,6 +2799,16 @@ def Test_vim9_autoload()
   g:some#other = 'other'
   assert_equal('other', g:some#other)
 
+  # upper case script name works
+  lines =<< trim END
+     vim9script
+     def Other#getOther(): string
+       return 'other'
+     enddef
+  END
+  writefile(lines, 'Xdir/autoload/Other.vim')
+  assert_equal('other', g:Other#getOther())
+
   delete('Xdir', 'rf')
   &rtp = save_rtp
 enddef

src/userfunc.c

@@ -2654,8 +2654,18 @@ trans_function_name(
 	goto theend;
     }
 
-    // In Vim9 script a user function is script-local by default.
+    // In Vim9 script a user function is script-local by default, unless it
+    // starts with a lower case character: dict.func().
     vim9script = ASCII_ISUPPER(*start) && in_vim9script();
+    if (vim9script)
+    {
+	char_u *p;
+
+	// SomeScript#func() is a global function.
+	for (p = start; *p != NUL && *p != '('; ++p)
+	    if (*p == AUTOLOAD_CHAR)
+		vim9script = FALSE;
+    }
 
     /*
      * Copy the function name to allocated memory.

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2164,
 /**/
     2163,
 /**/