patch 8.2.2450: MS-Windows: ADS was not preserved if 'backupcopy' is "yes"

Problem:    MS-Windows: ADS was not preserved if 'backupcopy' is "yes".
Solution:   Copy ADS before truncating the file. (Ken Takata, closes #7762)

Author: brammool

src/bufwrite.c

@@ -1496,6 +1496,9 @@ buf_write(
 #endif
 #if defined(HAVE_SELINUX) || defined(HAVE_SMACK)
 			mch_copy_sec(fname, backup);
+#endif
+#ifdef MSWIN
+			(void)mch_copy_file_attribute(fname, backup);
 #endif
 			break;
 		    }
@@ -1909,12 +1912,7 @@ buf_write(
 
 #if defined(MSWIN)
 	    if (backup != NULL && overwriting && !append)
-	    {
-		if (backup_copy)
-		    (void)mch_copy_file_attribute(wfname, backup);
-		else
-		    (void)mch_copy_file_attribute(backup, wfname);
-	    }
+		(void)mch_copy_file_attribute(backup, wfname);
 
 	    if (!overwriting && !append)
 	    {

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2450,
 /**/
     2449,
 /**/