Merge #9348 from janlazo/vim-8.0.1748

vim-patch:8.0.1748

src/nvim/ex_docmd.c

@@ -8654,7 +8654,10 @@ eval_vars (
       break;
 
     case SPEC_AFILE:  // file name for autocommand
-      if (autocmd_fname != NULL && !path_is_absolute(autocmd_fname)) {
+      if (autocmd_fname != NULL
+          && !path_is_absolute(autocmd_fname)
+          // For CmdlineEnter and related events, <afile> is not a path! #9348
+          && !strequal("/", (char *)autocmd_fname)) {
         // Still need to turn the fname into a full path.  It was
         // postponed to avoid a delay when <afile> is not used.
         result = (char_u *)FullName_save((char *)autocmd_fname, false);

src/nvim/fileio.c

@@ -6903,7 +6903,13 @@ static bool apply_autocmds_group(event_T event, char_u *fname, char_u *fname_io,
   } else {
     sfname = vim_strsave(fname);
     // Don't try expanding the following events.
-    if (event == EVENT_COLORSCHEME
+    if (event == EVENT_CMDLINECHANGED
+        || event == EVENT_CMDLINEENTER
+        || event == EVENT_CMDLINELEAVE
+        || event == EVENT_CMDWINENTER
+        || event == EVENT_CMDWINLEAVE
+        || event == EVENT_CMDUNDEFINED
+        || event == EVENT_COLORSCHEME
         || event == EVENT_COLORSCHEMEPRE
         || event == EVENT_DIRCHANGED
         || event == EVENT_FILETYPE

src/nvim/testdir/test_autocmd.vim

@@ -840,6 +840,8 @@ func Test_Cmdline()
   au! CmdlineEnter
   au! CmdlineLeave
 
+  let save_shellslash = &shellslash
+  set noshellslash
   au! CmdlineEnter / let g:entered = expand('<afile>')
   au! CmdlineLeave / let g:left = expand('<afile>')
   let g:entered = 0
@@ -852,6 +854,7 @@ func Test_Cmdline()
   bwipe!
   au! CmdlineEnter
   au! CmdlineLeave
+  let &shellslash = save_shellslash
 endfunc
 
 " Test for BufWritePre autocommand that deletes or unloads the buffer.