vim-patch:8.0.0020

Problem:    The regexp engines are not reentrant.
Solution:   Add regexec_T and save/restore the state when needed.

6100d02aab

src/nvim/version.c

@@ -709,7 +709,7 @@ static const int included_patches[] = {
   23,
   // 22 NA
   // 21,
-  // 20,
+  20,
   19,
   // 18,
   17,