Patch 7.4.979
Problem:    When changing the crypt key the blocks read from disk are not
            decrypted.
Solution:   Also call ml_decrypt_data() when mf_old_key is set. (Ken Takata)
Files:      src/memfile.c


*** ../vim-7.4.978/src/memfile.c        2015-06-09 18:35:17.467406952 +0200
--- src/memfile.c       2015-12-19 15:20:00.169578882 +0100
***************
*** 1032,1039 ****
      }
  
  #ifdef FEAT_CRYPT
!     /* Decrypt if 'key' is set and this is a data block. */
!     if (*mfp->mf_buffer->b_p_key != NUL)
        ml_decrypt_data(mfp, hp->bh_data, offset, size);
  #endif
  
--- 1032,1040 ----
      }
  
  #ifdef FEAT_CRYPT
!     /* Decrypt if 'key' is set and this is a data block. And when changing the
!      * key. */
!     if (*mfp->mf_buffer->b_p_key != NUL || mfp->mf_old_key != NULL)
        ml_decrypt_data(mfp, hp->bh_data, offset, size);
  #endif
  
*** ../vim-7.4.978/src/version.c        2015-12-19 15:15:49.888288506 +0100
--- src/version.c       2015-12-19 15:24:40.442543597 +0100
***************
*** 743,744 ****
--- 743,746 ----
  {   /* Add new patch number below this line */
+ /**/
+     979,
  /**/

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