Remapping <ctrl-a> to "ggVG" doesn't work

[zzhixin]

Describe the bug
I want to remap <ctrl-a> to "ggVG" to select all text in visual mode from normal mode. Just like what setting map <C-a> ggVG in .vimrc file does.

Defaultly, from normal mode, pressing <ctrl-a> fails to select text in visual mode. If you press y afterwards, all text won't be yank.

Having tried modifying the setting.json and vscode.vimrc as following, neither works.

To Reproduce
Steps to reproduce the behavior:

1(a). changing setting.json:

    "vim.normalModeKeyBindingsNonRecursive": [
        {
            "before": ["<C-a>"],
            "after": ["g", "g", "V", "G"]
        },

or
1(b). modifying $HOME/vscode.vimrc:

map <C-a> ggVG

then
2. open a file, enter vim normal mode, press Ctrl a, fails to enter visual mode.

Also tried disabling the system shortcuts ctrl-a, still not work.

Expected behavior
Open a file, enter vim normal mode, press Ctrl a, enter visual mode and select all lines. Then you can use d or y to do further operation. Just like what setting map <C-a> ggVG in .vimrc file does.

Environment (please complete the following information):

• Extension (VsCodeVim) version: v1.30.1
• VSCode version: 1.101.2
• OS: Linux x64 6.8.0-60-generic