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Problem: Treesitter fold is not updated if treesitter hightlight is not active. More precisely, updating folds requires `LanguageTree:parse()`. Solution: Call `parse()` before computing folds and compute folds when lines are added/removed. This doesn't guarantee correctness of the folds, because some changes that don't add/remove line won't update the folds even if they should (e.g. adding pair of braces). But it is good enough for most cases, while not introducing big overhead. Also, if highlighting is active, it is likely that `TSHighlighter._on_buf` already ran `parse()` (or vice versa).