patch 8.2.1423: Vim9: find global function when looking for script-local

Problem:    Vim9: find global function when looking for script-local.
Solution:   Don't strip prefix if name starts with "s:". (closes #6688)
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 4a020c9..772b52a 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -203,6 +203,15 @@
       assert_equal('local', Func())
   END
   CheckScriptSuccess(lines)
+
+  lines =<< trim END
+      vim9script
+      def g:Funcy()
+        echo 'funcy'
+      enddef
+      s:Funcy()
+  END
+  CheckScriptFailure(lines, 'E117:')
 enddef
 
 func TakesOneArg(arg)
diff --git a/src/userfunc.c b/src/userfunc.c
index f38c978f..9ab5ffe 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -2132,8 +2132,8 @@
 		char_u *p = untrans_function_name(rfname);
 
 		// If using Vim9 script try not local to the script.
-		// TODO: should not do this if the name started with "s:".
-		if (p != NULL)
+		// Don't do this if the name starts with "s:".
+		if (p != NULL && (funcname[0] != 's' || funcname[1] != ':'))
 		    fp = find_func(p, is_global, NULL);
 	    }
 
diff --git a/src/version.c b/src/version.c
index 8ebd3e0..f6257b5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1423,
+/**/
     1422,
 /**/
     1421,