Keybindings in delete mode not working

[janhesters]

Describe the bug
I'm using the Dvorak keyboard layout. Therefore I rebound my navigation keys. But in the delete mode they are not working (e.g. d3h).

To Reproduce
Steps to reproduce the behavior:

Add these settings:

 "vim.normalModeKeyBindingsNonRecursive": [
    { "before": ["h"], "after": ["<left>"] },
    { "before": ["t"], "after": ["<down>"] },
    { "before": ["s"], "after": ["<right>"] },
    { "before": ["n"], "after": ["<up>"] }
    // { "before": ["b"], "after": ["s"] }
  ],
  "vim.visualModeKeyBindingsNonRecursive": [
    { "before": ["h"], "after": ["<left>"] },
    { "before": ["t"], "after": ["<down>"] },
    { "before": ["s"], "after": ["<right>"] },
    { "before": ["n"], "after": ["<p>"] }
  ],

Now try to do: d3t which should now be 'delete 3 down'. This doesn't work. Instead now the t meaning the new <down> does not work. Instead, d3j (in QWERTY h3j) now works.

How can I also bind <down> in delete mode?

Expected behavior
3 lines down get deleted.

Environment (please complete the following information):

• Issue Type: Bug
• Extension Name: vim
• Extension Version: 1.0.3
• OS Version: Darwin x64 18.0.0
• VSCode version: 1.30.2