refactor: eliminate autocmd_fname_full global

It's a micro-optimization; check path_is_absolute_path(autocmd_fname)
instead.

The main optimization (which is still in place) afforded by Vim 7.2.021
was to avoid resolving <afile> when it is not needed.

src/nvim/eval.c

@@ -13814,7 +13814,7 @@ static void f_rpcrequest(typval_T *argvars, typval_T *rettv, FunPtr fptr)
   scid_T save_current_SID;
   uint8_t *save_sourcing_name, *save_autocmd_fname, *save_autocmd_match;
   linenr_T save_sourcing_lnum;
-  int save_autocmd_fname_full, save_autocmd_bufnr;
+  int save_autocmd_bufnr;
   void *save_funccalp;
 
   if (l_provider_call_nesting) {
@@ -13825,7 +13825,6 @@ static void f_rpcrequest(typval_T *argvars, typval_T *rettv, FunPtr fptr)
     save_sourcing_lnum = sourcing_lnum;
     save_autocmd_fname = autocmd_fname;
     save_autocmd_match = autocmd_match;
-    save_autocmd_fname_full = autocmd_fname_full;
     save_autocmd_bufnr = autocmd_bufnr;
     save_funccalp = save_funccal();
 
@@ -13834,7 +13833,6 @@ static void f_rpcrequest(typval_T *argvars, typval_T *rettv, FunPtr fptr)
     sourcing_lnum = provider_caller_scope.sourcing_lnum;
     autocmd_fname = provider_caller_scope.autocmd_fname;
     autocmd_match = provider_caller_scope.autocmd_match;
-    autocmd_fname_full = provider_caller_scope.autocmd_fname_full;
     autocmd_bufnr = provider_caller_scope.autocmd_bufnr;
     restore_funccal(provider_caller_scope.funccalp);
   }
@@ -13850,7 +13848,6 @@ static void f_rpcrequest(typval_T *argvars, typval_T *rettv, FunPtr fptr)
     sourcing_lnum = save_sourcing_lnum;
     autocmd_fname = save_autocmd_fname;
     autocmd_match = save_autocmd_match;
-    autocmd_fname_full = save_autocmd_fname_full;
     autocmd_bufnr = save_autocmd_bufnr;
     restore_funccal(save_funccalp);
   }
@@ -22448,7 +22445,6 @@ typval_T eval_call_provider(char *provider, char *method, list_T *arguments)
     .sourcing_lnum = sourcing_lnum,
     .autocmd_fname = autocmd_fname,
     .autocmd_match = autocmd_match,
-    .autocmd_fname_full = autocmd_fname_full,
     .autocmd_bufnr = autocmd_bufnr,
     .funccalp = save_funccal()
   };

src/nvim/ex_docmd.c

@@ -8546,11 +8546,10 @@ eval_vars (
       resultbuf = result;                   /* remember allocated string */
       break;
 
-    case SPEC_AFILE:            /* file name for autocommand */
-      if (autocmd_fname != NULL && !autocmd_fname_full) {
+    case SPEC_AFILE:  // file name for autocommand
+      if (autocmd_fname != NULL && !path_is_absolute_path(autocmd_fname)) {
         // Still need to turn the fname into a full path.  It was
         // postponed to avoid a delay when <afile> is not used.
-        autocmd_fname_full = true;
         result = (char_u *)FullName_save((char *)autocmd_fname, false);
         // Copy into `autocmd_fname`, don't reassign it. #8165
         xstrlcpy((char *)autocmd_fname, (char *)result, MAXPATHL);

src/nvim/fileio.c

@@ -6655,7 +6655,6 @@ static bool apply_autocmds_group(event_T event, char_u *fname, char_u *fname_io,
   char_u      *save_sourcing_name;
   linenr_T save_sourcing_lnum;
   char_u      *save_autocmd_fname;
-  int save_autocmd_fname_full;
   int save_autocmd_bufnr;
   char_u      *save_autocmd_match;
   int save_autocmd_busy;
@@ -6728,7 +6727,6 @@ static bool apply_autocmds_group(event_T event, char_u *fname, char_u *fname_io,
    * Save the autocmd_* variables and info about the current buffer.
    */
   save_autocmd_fname = autocmd_fname;
-  save_autocmd_fname_full = autocmd_fname_full;
   save_autocmd_bufnr = autocmd_bufnr;
   save_autocmd_match = autocmd_match;
   save_autocmd_busy = autocmd_busy;
@@ -6758,7 +6756,6 @@ static bool apply_autocmds_group(event_T event, char_u *fname, char_u *fname_io,
     // Allocate MAXPATHL for when eval_vars() resolves the fullpath.
     autocmd_fname = vim_strnsave(autocmd_fname, MAXPATHL);
   }
-  autocmd_fname_full = false;   // call FullName_save() later
 
   /*
    * Set the buffer number to be used for <abuf>.
@@ -6925,7 +6922,6 @@ static bool apply_autocmds_group(event_T event, char_u *fname, char_u *fname_io,
   sourcing_lnum = save_sourcing_lnum;
   xfree(autocmd_fname);
   autocmd_fname = save_autocmd_fname;
-  autocmd_fname_full = save_autocmd_fname_full;
   autocmd_bufnr = save_autocmd_bufnr;
   autocmd_match = save_autocmd_match;
   current_SID = save_current_SID;

src/nvim/globals.h

@@ -416,7 +416,7 @@ EXTERN struct caller_scope {
   scid_T SID;
   uint8_t *sourcing_name, *autocmd_fname, *autocmd_match; 
   linenr_T sourcing_lnum;
-  int autocmd_fname_full, autocmd_bufnr;
+  int autocmd_bufnr;
   void *funccalp;
 } provider_caller_scope;
 EXTERN int provider_call_nesting INIT(= 0);
@@ -872,7 +872,6 @@ EXTERN char_u *last_cmdline INIT(= NULL);      // last command line (for ":)
 EXTERN char_u *repeat_cmdline INIT(= NULL);    // command line for "."
 EXTERN char_u *new_last_cmdline INIT(= NULL);  // new value for last_cmdline
 EXTERN char_u *autocmd_fname INIT(= NULL);     // fname for <afile> on cmdline
-EXTERN int autocmd_fname_full;                 // autocmd_fname is full path
 EXTERN int autocmd_bufnr INIT(= 0);            // fnum for <abuf> on cmdline
 EXTERN char_u *autocmd_match INIT(= NULL);     // name for <amatch> on cmdline
 EXTERN int did_cursorhold INIT(= false);       // set when CursorHold t'gerd