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https://github.com/neovim/neovim
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4778a4c201
Problem: Calling lsp.codelens.refresh() causes transient visual flicker because codelens virtual texts are briefly replaced with "Unresolved lens ..." before being resolved and redrawn. Since refresh() is triggered frequently (e.g., on CursorHold or InsertLeave), this leads to redundant and noisy virtual text updates, even when the final text hasn't changed. Solution: Do not update virtual text for a line if some lenses for that line are not resolved yet. A trade-off is that the user may temporarily see outdated virtual text. However, that's preferable to spamming updates on every refresh.
