Patch 8.1.2085
Problem:    MS-Windows: draw error moving cursor over double-cell character.
Solution:   Move the cursor to the left edge if needed. (Nobuhiro Takasaki,
            closes #4986)
Files:      src/os_win32.c


*** ../vim-8.1.2084/src/os_win32.c      2019-09-21 23:09:00.979830687 +0200
--- src/os_win32.c      2019-09-27 14:13:52.261612976 +0200
***************
*** 5831,5837 ****
  
  
  /*
!  * Set the cursor position
   */
      static void
  gotoxy(
--- 5831,5837 ----
  
  
  /*
!  * Set the cursor position to (x,y) (1-based).
   */
      static void
  gotoxy(
***************
*** 5841,5854 ****
      if (x < 1 || x > (unsigned)Columns || y < 1 || y > (unsigned)Rows)
        return;
  
-     /* external cursor coords are 1-based; internal are 0-based */
-     g_coord.X = x - 1;
-     g_coord.Y = y - 1;
- 
      if (!USE_VTP)
        SetConsoleCursorPosition(g_hConOut, g_coord);
      else
        vtp_printf("\033[%d;%dH", y, x);
  }
  
  
--- 5841,5865 ----
      if (x < 1 || x > (unsigned)Columns || y < 1 || y > (unsigned)Rows)
        return;
  
      if (!USE_VTP)
+     {
+       // external cursor coords are 1-based; internal are 0-based
+       g_coord.X = x - 1;
+       g_coord.Y = y - 1;
        SetConsoleCursorPosition(g_hConOut, g_coord);
+     }
      else
+     {
+       // Move the cursor to the left edge of the screen to prevent screen
+       // destruction.  Insider build bug.
+       if (conpty_type == 3)
+           vtp_printf("\033[%d;%dH", g_coord.Y + 1, 1);
+ 
        vtp_printf("\033[%d;%dH", y, x);
+ 
+       g_coord.X = x - 1;
+       g_coord.Y = y - 1;
+     }
  }
  
  
***************
*** 7266,7272 ****
   * Confirm until this version.  Also the logic changes.
   * insider preview.
   */
! #define CONPTY_INSIDER_BUILD      MAKE_VER(10, 0, 18898)
  
  /*
   * Not stable now.
--- 7277,7283 ----
   * Confirm until this version.  Also the logic changes.
   * insider preview.
   */
! #define CONPTY_INSIDER_BUILD      MAKE_VER(10, 0, 18990)
  
  /*
   * Not stable now.
*** ../vim-8.1.2084/src/version.c       2019-09-27 13:38:52.782752934 +0200
--- src/version.c       2019-09-27 14:14:03.577562089 +0200
***************
*** 759,760 ****
--- 759,762 ----
  {   /* Add new patch number below this line */
+ /**/
+     2085,
  /**/

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