3

I'm creating a session with mksession, and when I restore the session, if the first tab was empty ([No Name]), it's gone in the restored session. Other empty tabs are restored fine; it seems to only be the first tab that's lost. If there are multiple "leading" empty tabs, it's still only the first one that disappears.

I'm using this with vim -u NONE so there is zero config and no plugins, but I get the same behavior with my normal config. Affects versions 7.3 and 8.0.52.

I'm using the default sessionoptions in all cases: blank,buffers,curdir,folds,options,tabpages,winsize.

Steps to reproduce:

  • $ vim -u NONE
  • :tabnew
  • :e foo.txt
  • :w
  • :tabnew
  • :mksession
  • :qa
  • $ vim -u NONE -S Session.vim

The tabline now shows foo.txt | [No Name]. Expected [No Name] | foo.txt | [No Name].

Is this is known issue? Is there a workaround?

  • 1
    I can confirm it behaves like this. Sounds like a bug? This is probably best reported to the vim_dev list or the GitHub issue tracker. – Martin Tournoij Nov 24 '16 at 12:12
  • I'll report it on both and look into a fix. I use a plugin I wrote which uses fixed, labeled tabs so this messes with my workflow a bit. – Jim Stewart Nov 24 '16 at 14:35
2

This is indeed a bug in Vim. I filed a GitHub issue, and someone on the vim-dev mailing list addressed it.

Here's a patch that fixes it in Vim 8.0.52:

diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 439467c..ca4133a 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -11091,6 +11091,8 @@ makeopens(
        }
        if (tabnr > 1)
        need_tabnew = TRUE;
+       else if (put_line(fd, "new") == FAIL)
+       return FAIL;
    }

    /*

Patch courtesy Hirohito Higashi on the vim-dev mailing list. I imagine it will make its way into the official distribution.

Update:

This was fixed in Vim 8.1.0149 (see GitHub PR).

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