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fix(folding): optimize fold/unfold all #223
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The previous recursive function repeatedly calls
_update_lines()which is expensive. This makes my nvim freeze up even when working with smaller files; it's a terrible experience with larger files with a lot of symbol.Changed it to an iterative algorithm and calling
_update_lines()once at the end after the nodes have been updated. It should help with the memory usage too since the previous recursion wasn't tail call optimized.fixes #224