Temporary fix for snippets and undo

[almounah]

A bug was detected on this environment

• NVIM v0.9.4
• typescript-language-server tsserver version 4.2.0 (installed with Mason)
• These plugins to get snippets (installed with packer):

 use {
        "hrsh7th/nvim-cmp",
        "hrsh7th/cmp-nvim-lsp",
        "L3MON4D3/LuaSnip",
        "saadparwaiz1/cmp_luasnip",
        "rafamadriz/friendly-snippets"
    }   

To reproduce

1. Open a Javascript file
2. Write a for using a snippet, but don't fill anything.
3. Press Esc then undo the snippet with u
4. Recreate a for using the snippet

You should see an indexin error as follows:

This PR proposes a temporary fix. It may not be the best solution but it should work if I am not mistaken...
Any improvement ideas and critiques are very appreciated

[L3MON4D3]

Sorry, forgot to comment on this before:
I think I know what's going wrong there, lemme create a branch with (what I think) could be the fix

[L3MON4D3]

Nvm I don't know what's going wrong.. Could you create a MWE?

[L3MON4D3]

Ha, I do know what went wrong (Or, at least I think that's what went wrong for you).
Could you try the undo-fix-branch?

[almounah]

@L3MON4D3 The undo-fix works and actually fix the bug :-)

[L3MON4D3]

Nice, I'll put that on master then :D

[L3MON4D3]

Okay, 43c8963 is on master