patch 8.2.1850: "vat" does not select tags correctly over line break

Problem:    "vat" does not select tags correctly over line break.
Solution:   Adjust the search pattern. (Aufar Gilbran, closes #7136)
diff --git a/src/textobject.c b/src/textobject.c
index 23bdc96..2d5d5dd 100644
--- a/src/textobject.c
+++ b/src/textobject.c
@@ -1347,7 +1347,7 @@
 	curwin->w_cursor = old_pos;
 	goto theend;
     }
-    spat = alloc(len + 31);
+    spat = alloc(len + 39);
     epat = alloc(len + 9);
     if (spat == NULL || epat == NULL)
     {
@@ -1356,7 +1356,7 @@
 	curwin->w_cursor = old_pos;
 	goto theend;
     }
-    sprintf((char *)spat, "<%.*s\\>\\%%(\\s\\_[^>]\\{-}[^/]>\\|>\\)\\c", len, p);
+    sprintf((char *)spat, "<%.*s\\>\\%%(\\_s\\_[^>]\\{-}\\_[^/]>\\|\\_s\\?>\\)\\c", len, p);
     sprintf((char *)epat, "</%.*s>\\c", len, p);
 
     r = do_searchpair(spat, (char_u *)"", epat, FORWARD, NULL,