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It's been a while since I used an IDE (instead of vim), but don't most of them support code-folding that provides a light gray bracket for a block of code (usually with a collapsible indicator at the top)?

Or is the effect you want slightly different?

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Note vim can do folds too. (Not a commonly known feature, I only learned about it recently myself.) But the effect he wants is the literal bars showing indentation levels which I think some IDEs have... vim could fake it by highlighting the bg cells.

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