Overlapping folding ranges

[renkun-ken]

Currently, the folding ranges are created from all multi-line expressions and there could be overlaps in the parse data.

For example, consider the following if-else blocks:

if (x > 0) {
  # hello
  # hello2
  x + 1
} else if (x < -1) {
  x - 1
} else {
  x
}

Collapsing a block could end up hiding the whole expression as demonstrated below:

It is a bit non-standard compared with the folding ranges provided by other language servers.