[folding] [lua] Weird code folding with Lua

[zethon]

A minor observation about an otherwise great feature! Using the Insiders build, the following Lua code causes weird folding:

function someFunc()

    local longString = [[this is a long
string that spans multiple lines
and has some weird folding]]

    print longString
end

You'll notice that a + shows up on the same "function someFunc()" line and on the last line of the longString declaration. The first + folds up to the declaration line and the second + folds the rest of the function.

[Tyriar]

Code folding is currently based on indentation, this is blocked by language-aware folding #3422

[aeschli]

duplicate of #3422