Included patch for persistent undo. Lots of changes and added test.
diff --git a/src/structs.h b/src/structs.h
index a34fa66..a7632b8 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -1465,6 +1465,9 @@
char_u *b_p_dict; /* 'dictionary' local value */
char_u *b_p_tsr; /* 'thesaurus' local value */
#endif
+#ifdef FEAT_PERSISTENT_UNDO
+ int b_p_udf; /* 'undofile' */
+#endif
/* end of buffer options */
@@ -2392,3 +2395,9 @@
#define CPT_KIND 2 /* "kind" */
#define CPT_INFO 3 /* "info" */
#define CPT_COUNT 4 /* Number of entries */
+
+typedef struct {
+ UINT32_T total[2];
+ UINT32_T state[8];
+ char_u buffer[64];
+} context_sha256_T;