shada: Add support for dumping/restoring bufs changes and win jumps

src/nvim/lib/khash.h

@@ -577,6 +577,19 @@ static kh_inline khint_t __ac_Wang_hash(khint_t key)
 		code;												\
 	} }
 
+/*! @function
+  @abstract     Iterate over the keys in the hash table
+  @param  h     Pointer to the hash table [khash_t(name)*]
+  @param  kvar  Variable to which value will be assigned
+  @param  code  Block of code to execute
+ */
+#define kh_foreach_key(h, kvar, code) { khint_t __i;		\
+	for (__i = kh_begin(h); __i != kh_end(h); ++__i) {		\
+		if (!kh_exist(h,__i)) continue;						\
+		(kvar) = kh_key(h,__i);								\
+		code;												\
+	} }
+
 /* More conenient interfaces */
 
 /*! @function