vim-patch:8.1.0337: :file fails in quickfix command (#9215)

Problem:    :file fails in quickfix command.
Solution:   Allow :file without argument when curbuf_lock is set. (Jason
            Franklin)
https://github.com/vim/vim/commit/379fb76b080521f7c09265ec3264b9e698923518

1 files changed, 14 insertions, 5 deletions

diff --git a/src/nvim/ex_docmd.c b/src/nvim/ex_docmd.c
index 6ac7656a2f..6361267d9b 100644
--- a/src/nvim/ex_docmd.c
+++ b/src/nvim/ex_docmd.c
@@ -1804,15 +1804,19 @@ static char_u * do_one_cmd(char_u **cmdlinep,
       errormsg = (char_u *)_(get_text_locked_msg());
       goto doend;
     }
-    /* Disallow editing another buffer when "curbuf_lock" is set.
-     * Do allow ":edit" (check for argument later).
-     * Do allow ":checktime" (it's postponed). */
+
+    // Disallow editing another buffer when "curbuf_lock" is set.
+    // Do allow ":checktime" (it is postponed).
+    // Do allow ":edit" (check for an argument later).
+    // Do allow ":file" with no arguments (check for an argument later).
     if (!(ea.argt & CMDWIN)
-        && ea.cmdidx != CMD_edit
         && ea.cmdidx != CMD_checktime
+        && ea.cmdidx != CMD_edit
+        && ea.cmdidx != CMD_file
         && !IS_USER_CMDIDX(ea.cmdidx)
-        && curbuf_locked())
+        && curbuf_locked()) {
       goto doend;
+    }
 
     if (!ni && !(ea.argt & RANGE) && ea.addr_count > 0) {
       /* no range allowed */
@@ -1884,6 +1888,11 @@ static char_u * do_one_cmd(char_u **cmdlinep,
   else
     ea.arg = skipwhite(p);
 
+  // ":file" cannot be run with an argument when "curbuf_lock" is set
+  if (ea.cmdidx == CMD_file && *ea.arg != NUL && curbuf_locked()) {
+    goto doend;
+  }
+
   /*
    * Check for "++opt=val" argument.
    * Must be first, allow ":w ++enc=utf8 !cmd"