Patch 8.1.0067
Problem:    Syntax highlighting not working when re-entering a buffer.
Solution:   Do force executing autocommands when not called recursively.
Files:      src/option.c


*** ../vim-8.1.0066/src/option.c        2018-06-17 17:32:55.088218019 +0200
--- src/option.c        2018-06-17 19:01:55.382567829 +0200
***************
*** 7567,7590 ****
        /* When 'syntax' is set, load the syntax of that name */
        if (varp == &(curbuf->b_p_syn))
        {
!           // Only pass TRUE for "force" when the value changed, to avoid
!           // endless recurrence. */
!           apply_autocmds(EVENT_SYNTAX, curbuf->b_p_syn,
!                                      curbuf->b_fname, value_changed, curbuf);
        }
  #endif
        else if (varp == &(curbuf->b_p_ft))
        {
            /* 'filetype' is set, trigger the FileType autocommand.
             * Skip this when called from a modeline and the filetype was
!            * already set to this value.
!            * Only pass TRUE for "force" when the value changed, to avoid
!            * endless recurrence. */
            if (!(opt_flags & OPT_MODELINE) || value_changed)
            {
                did_filetype = TRUE;
!               apply_autocmds(EVENT_FILETYPE, curbuf->b_p_ft,
!                                      curbuf->b_fname, value_changed, curbuf);
                /* Just in case the old "curbuf" is now invalid. */
                if (varp != &(curbuf->b_p_ft))
                    varp = NULL;
--- 7567,7598 ----
        /* When 'syntax' is set, load the syntax of that name */
        if (varp == &(curbuf->b_p_syn))
        {
!           static int syn_recursive = 0;
! 
!           ++syn_recursive;
!           // Only pass TRUE for "force" when the value changed or not used
!           // recursively, to avoid endless recurrence.
!           apply_autocmds(EVENT_SYNTAX, curbuf->b_p_syn, curbuf->b_fname,
!                   value_changed || syn_recursive == 1, curbuf);
!           --syn_recursive;
        }
  #endif
        else if (varp == &(curbuf->b_p_ft))
        {
            /* 'filetype' is set, trigger the FileType autocommand.
             * Skip this when called from a modeline and the filetype was
!            * already set to this value. */
            if (!(opt_flags & OPT_MODELINE) || value_changed)
            {
+               static int ft_recursive = 0;
+ 
+               ++ft_recursive;
                did_filetype = TRUE;
!               // Only pass TRUE for "force" when the value changed or not
!               // used recursively, to avoid endless recurrence.
!               apply_autocmds(EVENT_FILETYPE, curbuf->b_p_ft, curbuf->b_fname,
!                                  value_changed || ft_recursive == 1, curbuf);
!               --ft_recursive;
                /* Just in case the old "curbuf" is now invalid. */
                if (varp != &(curbuf->b_p_ft))
                    varp = NULL;
*** ../vim-8.1.0066/src/version.c       2018-06-17 17:32:55.088218019 +0200
--- src/version.c       2018-06-17 19:07:00.000819142 +0200
***************
*** 763,764 ****
--- 763,766 ----
  {   /* Add new patch number below this line */
+ /**/
+     67,
  /**/

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