Issue with cursor position using visual line movement (`gj` and `gk`)

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What did you do?

I've set the following as I like to work with word wrap enabled:

    "vim.otherModesKeyBindingsNonRecursive": [
        {
            "before": ["j"],
            "after": ["g", "j"]
        },
        {
            "before": ["k"],
            "after": ["g", "k"]
        }
    ]

I noticed a discrepancy in behaviour for lines without wrapping. As you navigate between lines of varying length the cursor position doesn't keep its horizontal position.

The following GIFs just show motion using j and k.

I would expect both GIFs to show the same thing regardless if the gj and gk mappings are applied.

What did you expect to happen?

Expected behaviour (the keybinding mappings not applied):

What happened instead?

Current behaviour (the keybinding mappings applied):

Technical details:

• VSCode Version: 1.9.1
• VsCodeVim Version: 0.5.3
• OS: MacOS 10.12.3

Reproduce the issue in VSCode Vim with word wrap enabled and the listed non-recursive j/k mappings, comparing them with direct gj/gk movement. Trace the cursor-motion handling and inspect the existing behavior around visual line movement. Done means mapped j and k preserve horizontal cursor position like direct gj and gk across lines of different lengths.