vim-patch:9.0.0261: bufload() reads a file even if the name is not a file name (#19944)

Problem:    bufload() reads a file even if the name is not a file name. (Cyker
            Way)
Solution:   Do not read the file when the buffer name is not a file name.
            (closes vim/vim#10975)
2eddbacd6d

src/nvim/buffer.c

@@ -224,7 +224,8 @@ int open_buffer(int read_stdin, exarg_T *eap, int flags)
   // mark cursor position as being invalid
   curwin->w_valid = 0;
 
-  if (curbuf->b_ffname != NULL) {
+  // Read the file if there is one.
+  if (curbuf->b_ffname != NULL && !bt_quickfix(curbuf) && !bt_nofilename(curbuf)) {
 #ifdef UNIX
     int save_bin = curbuf->b_p_bin;
     int perm;

src/nvim/testdir/test_functions.vim

@@ -1880,6 +1880,13 @@ func Test_bufadd_bufload()
   exe 'bwipe ' .. buf2
   call assert_equal(0, bufexists(buf2))
 
+  " when 'buftype' is "nofile" then bufload() does not read the file
+  bwipe! XotherName
+  let buf = bufadd('XotherName')
+  call setbufvar(buf, '&bt', 'nofile')
+  call bufload(buf)
+  call assert_equal([''], getbufline(buf, 1, '$'))
+
   bwipe someName
   bwipe XotherName
   call assert_equal(0, bufexists('someName'))