vim-patch:9.1.0011: regexp cannot match combining chars in collection (#26992)

Problem:  regexp cannot match combining chars in collection
Solution: Check for combining characters in regex collections for the
          NFA and BT Regex Engine

Also, while at it, make debug mode work again.

fixes vim/vim#10286
closes: vim/vim#12871

d2cc51f9a1

Co-authored-by: Christian Brabandt <cb@256bit.org>

test/old/testdir/test_regexp_utf8.vim

@@ -599,5 +599,16 @@ func Test_match_too_complicated()
   set regexpengine=0
 endfunc
 
+func Test_combining_chars_in_collection()
+  new
+  for i in range(0,2)
+    exe "set re=".i
+    put =['ɔ̃', 'ɔ',  '̃  ã', 'abcd']
+    :%s/[ɔ̃]//
+    call assert_equal(['', '', 'ɔ', '̃  ã', 'abcd'], getline(1,'$'))
+    %d
+  endfor
+  bw!
+endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab