Patch 8.0.0503
Problem:    Endless loop in updating folds with 32 bit ints.
Solution:   Subtract from LHS instead of add to the RHS. (Matthew Malcomson)
Files:      src/fold.c


*** ../vim-8.0.0502/src/fold.c  2017-03-16 22:06:51.824726916 +0100
--- src/fold.c  2017-03-23 21:19:13.084212797 +0100
***************
*** 2755,2761 ****
        /* End of fold found, update the length when it got shorter. */
        if (fp->fd_len != flp->lnum - fp->fd_top)
        {
!           if (fp->fd_top + fp->fd_len > bot + 1)
            {
                /* fold continued below bot */
                if (getlevel == foldlevelMarker
--- 2755,2761 ----
        /* End of fold found, update the length when it got shorter. */
        if (fp->fd_len != flp->lnum - fp->fd_top)
        {
!           if (fp->fd_top + fp->fd_len - 1 > bot)
            {
                /* fold continued below bot */
                if (getlevel == foldlevelMarker
*** ../vim-8.0.0502/src/version.c       2017-03-21 21:57:51.338404174 +0100
--- src/version.c       2017-03-23 21:20:47.115523702 +0100
***************
*** 766,767 ****
--- 766,769 ----
  {   /* Add new patch number below this line */
+ /**/
+     503,
  /**/

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