vim-patch:8.1.0223: completing shell command finds sub-directories in $PATH

Problem:    Completing shell command finds sub-directories in $PATH.
Solution:   Remove EW_DIR when completing an item in $PATH. (Jason Franklin)
6ab9e429da

src/nvim/ex_getln.c

@@ -5008,19 +5008,24 @@ static void expand_shellcmd(char_u *filepat, int *num_file, char_u ***file,
   hashtab_T found_ht;
   hash_init(&found_ht);
   for (s = path; ; s = e) {
+    e = vim_strchr(s, ENV_SEPCHAR);
+    if (e == NULL) {
+      e = s + STRLEN(s);
+    }
+
     if (*s == NUL) {
       if (did_curdir) {
         break;
       }
       // Find directories in the current directory, path is empty.
       did_curdir = true;
-    } else if (*s == '.') {
+      flags |= EW_DIR;
+    } else if (STRNCMP(s, ".", e - s) == 0) {
       did_curdir = true;
-    }
+      flags |= EW_DIR;
-
+    } else {
-    e = vim_strchr(s, ENV_SEPCHAR);
+      // Do not match directories inside a $PATH item.
-    if (e == NULL) {
+      flags &= ~EW_DIR;
-      e = s + STRLEN(s);
     }
 
     l = (size_t)(e - s);

src/nvim/testdir/test_cmdline.vim

@@ -301,7 +301,7 @@ func Test_getcompletion()
   call assert_equal([], l)
 
   let l = getcompletion('.', 'shellcmd')
-  call assert_equal(['./', '../'], l[0:1])
+  call assert_equal(['./', '../'], filter(l, 'v:val =~ "\\./"'))
   call assert_equal(-1, match(l[2:], '^\.\.\?/$'))
   let root = has('win32') ? 'C:\\' : '/'
   let l = getcompletion(root, 'shellcmd')
@@ -375,6 +375,29 @@ func Test_getcompletion()
   call assert_fails('call getcompletion("", "burp")', 'E475:')
 endfunc
 
+func Test_shellcmd_completion()
+  let save_path = $PATH
+
+  call mkdir('Xpathdir/Xpathsubdir', 'p')
+  call writefile([''], 'Xpathdir/Xfile.exe')
+  call setfperm('Xpathdir/Xfile.exe', 'rwx------')
+
+  " Set PATH to example directory without trailing slash.
+  let $PATH = getcwd() . '/Xpathdir'
+
+  " Test for the ":!<TAB>" case.  Previously, this would include subdirs of
+  " dirs in the PATH, even though they won't be executed.  We check that only
+  " subdirs of the PWD and executables from the PATH are included in the
+  " suggestions.
+  let actual = getcompletion('X', 'shellcmd')
+  let expected = map(filter(glob('*', 0, 1), 'isdirectory(v:val) && v:val[0] == "X"'), 'v:val . "/"')
+  call insert(expected, 'Xfile.exe')
+  call assert_equal(expected, actual)
+
+  call delete('Xpathdir', 'rf')
+  let $PATH = save_path
+endfunc
+
 func Test_expand_star_star()
   call mkdir('a/b', 'p')
   call writefile(['asdfasdf'], 'a/b/fileXname')