Weird extra line in messages after first leaving insert mode

[David Barnett]

I noticed a vim quirk where there's an extra blank line in the :messages output after first entering and leaving insert mode. The next :echomsg after that overwrites the blank line so there's no longer a blank line.

For example:
vim
:messages
Messages maintainer: Bram Moolenaar <Br...@vim.org>
i<Esc>
:messages
Messages maintainer: Bram Moolenaar <Br...@vim.org>

:echomsg 'Hello'
Hello
:messages
Messages maintainer: Bram Moolenaar <Br...@vim.org>
Hello

It's a small quirk, but is there any explanation why it's there, and any way to fix it? I noticed it when using a script that scrapes the output of :messages after each command and gets very confused by the fact that messages are randomly added and then removed retrospectively.

David

[David Barnett]

Also discovered it only happens in nocompatible mode.

David

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[David Barnett]

On further experimentation, I've found that vim apparently always overwrites a blank message:

  :echomsg ''

  :echomsg 'Foo'

  :messages

  Foo

So the overwriting is at least predictable even if it's surprising. But the issue of having a blank message written in the first place when you enter and leave insert mode is annoying.

David