Can't use double-quote in a mapping

[flwyd]

Self-Diagnosis

• I have searched the issues for an answer to my question.
• I have reviewed the NERDTree documentation. :h NERDTree
• I have reviewed the Wiki.
• I have searched the web for an answer to my question.

Environment (for bug reports)

• Operating System: MacOS
• Vim/Neovim version :echo v:version: 802
• NERDTree version, found on 1st line in NERDTree quickhelp ?: 6.10.0
• vimrc settings
  • NERDTree variables

  function! QuoteMapping() abort
    echo "Hello, world!"
  endfunction
  call NERDTreeAddKeyMap({'key': ',"', 'callback': 'QuoteMapping', 'quickhelpText': 'say hello'})

  • Other NERDTree-dependent Plugins
    • jistr/vim-nerdtree-tabs
    • ryanoasis/vim-devicons
    • tiagofumo/vim-nerdtree-syntax-highlight
    • Xuyuanp/nerdtree-git-plugin
    • Others (specify):
  • I've verified the issue occurs with only NERDTree installed.

Steps to Reproduce the Issue

1. Declare a NERDTree key mapping that involves a double-quote (")
2. Open NERDTree
3. Use the mapping

Current Result (Include screenshots where appropriate.)

E116: Invalid arguments for function nerdtree#ui_glue#invokeKeyMap

Expected Result

Mappings can include any ASCII character.

This can probably be addressed like #948. I don't know if any other characters also need to be escaped.