Provide editor.renderWhitespace "selection" option

[OlsonDev]

Sublime Text has the option:

    // Set to "none" to turn off drawing white space, "selection" to draw only the
    // white space within the selection, and "all" to draw all white space
    "draw_white_space": "selection",

I would like to see selection added to list of possible values for editor.renderWhitespace. I find it incredibly useful.

While writing code, I prefer to not show whitespace. However, when I copy-paste code snippets, I like to know the whitespace matches the target document by simply selecting it (usually via Ctrl+A), not using the arrow keys or toggling a setting.

Thanks

[bpasero]

@alexandrudima fyi

[elad]

I feel bad commenting "+1" on this issue, especially after the open letter to GitHub, but there's no other way of letting you know how important this is to me without doing so. So +1. :)

[samal-rasmussen]

50 thumb ups atm, multiple duplicates, but no no movement on this for a year? Seems like a low hanging fruit ripe for the picking to me. Anybody?

[RomainLanz]

Hopefully this will be added in the next release!

[mignz]

Taking a while... :(