Patch 8.1.0059
Problem:    Displayed digraph for "ga" wrong with 'encoding' "cp1251".
Solution:   Convert from 'encoding' to "utf-8" if needed. (closes #3015)
Files:      src/digraph.c, src/testdir/test_digraph.vim


*** ../vim-8.1.0058/src/digraph.c       2018-02-27 20:01:13.000000000 +0100
--- src/digraph.c       2018-06-16 17:06:04.657272887 +0200
***************
*** 1979,1992 ****
   * If not found return NULL.
   */
      char_u *
! get_digraph_for_char(val)
!     int val;
  {
      int               i;
      int               use_defaults;
      digr_T    *dp;
      static      char_u      r[3];
  
      for (use_defaults = 0; use_defaults <= 1; use_defaults++)
      {
        if (use_defaults == 0)
--- 1979,2015 ----
   * If not found return NULL.
   */
      char_u *
! get_digraph_for_char(int val_arg)
  {
+     int               val = val_arg;
      int               i;
      int               use_defaults;
      digr_T    *dp;
      static      char_u      r[3];
  
+ #if defined(FEAT_MBYTE) && defined(USE_UNICODE_DIGRAPHS)
+     if (!enc_utf8)
+     {
+       char_u      buf[6], *to;
+       vimconv_T   vc;
+ 
+       // convert the character from 'encoding' to Unicode
+       i = mb_char2bytes(val, buf);
+       vc.vc_type = CONV_NONE;
+       if (convert_setup(&vc, p_enc, (char_u *)"utf-8") == OK)
+       {
+           vc.vc_fail = TRUE;
+           to = string_convert(&vc, buf, &i);
+           if (to != NULL)
+           {
+               val = utf_ptr2char(to);
+               vim_free(to);
+           }
+           (void)convert_setup(&vc, NULL, NULL);
+       }
+     }
+ #endif
+ 
      for (use_defaults = 0; use_defaults <= 1; use_defaults++)
      {
        if (use_defaults == 0)
*** ../vim-8.1.0058/src/testdir/test_digraph.vim        2018-02-27 
21:08:09.000000000 +0100
--- src/testdir/test_digraph.vim        2018-06-16 17:15:21.629331405 +0200
***************
*** 465,468 ****
--- 465,480 ----
    bwipe!
  endfunc
  
+ func Test_show_digraph_cp1251()
+   if !has('multi_byte')
+     return
+   endif
+   new
+   set encoding=cp1251
+   call Put_Dig("='")
+   call assert_equal("\n<\xfa>  <|z>  <M-z>  250,  Hex fa,  Oct 372, Digr ='", 
execute('ascii'))
+   set encoding=utf-8
+   bwipe!
+ endfunc
+ 
  " vim: shiftwidth=2 sts=2 expandtab
*** ../vim-8.1.0058/src/version.c       2018-06-16 16:20:48.772597946 +0200
--- src/version.c       2018-06-16 17:07:11.244898262 +0200
***************
*** 763,764 ****
--- 763,766 ----
  {   /* Add new patch number below this line */
+ /**/
+     59,
  /**/

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