vim-patch:7.4.646 #2926

Problem:    ":bufdo" may start at a deleted buffer.
Solution:   Find the first not deleted buffer. (Shane Harper)

https://github.com/vim/vim/commit/v7-4-646

src/nvim/ex_cmds2.c

@@ -1862,20 +1862,30 @@ void ex_listdo(exarg_T *eap)
       case CMD_argdo:
         i = eap->line1 - 1;
         break;
-      case CMD_bufdo:
-        i = eap->line1;
-        break;
       default:
         break;
     }
+    buf_T *buf = curbuf;
     /* set pcmark now */
-    if (eap->cmdidx == CMD_bufdo)
-      goto_buffer(eap, DOBUF_FIRST, FORWARD, i);
-    else
+    if (eap->cmdidx == CMD_bufdo) {
+      /* Advance to the first listed buffer after "eap->line1". */
+      for (buf = firstbuf;
+           buf != NULL && (buf->b_fnum < eap->line1 || !buf->b_p_bl);
+           buf = buf->b_next) {
+        if (buf->b_fnum > eap->line2) {
+          buf = NULL;
+          break;
+        }
+      }
+      if (buf != NULL) {
+        goto_buffer(eap, DOBUF_FIRST, FORWARD, buf->b_fnum);
+      }
+    } else {
       setpcmark();
+    }
     listcmd_busy = TRUE;            /* avoids setting pcmark below */
 
-    while (!got_int) {
+    while (!got_int && buf != NULL) {
       if (eap->cmdidx == CMD_argdo) {
         /* go to argument "i" */
         if (i == ARGCOUNT)

src/nvim/testdir/test_command_count.in

@@ -141,6 +141,7 @@ STARTTEST
 :let buffers = ''
 :.,$-bufdo let buffers .= ' '.bufnr('%')
 :call add(g:lines, 'bufdo:' . buffers)
+:3bd
 :let buffers = ''
 :3,7bufdo let buffers .= ' '.bufnr('%')
 :call add(g:lines, 'bufdo:' . buffers)

src/nvim/testdir/test_command_count.ok

@@ -34,5 +34,5 @@ aaa: 0 bbb: 0 ccc: 0
 argdo: c d e
 windo: 2 3 4
 bufdo: 2 3 4 5 6 7 8 9 10 15
-bufdo: 3 4 5 6 7
+bufdo: 4 5 6 7
 tabdo: 2 3 4

src/nvim/version.c

@@ -163,7 +163,7 @@ static int included_patches[] = {
   //649,
   //648 NA
   //647 NA
-  //646,
+  646,
   //645,
   //644 NA
   //643,