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Previously, when using foldmethod=indent, inserting an unindented line would inadvertently open closed folds below it. As a performance improvement, folds were only updated once, across all lines, after Insert mode was exited. Now, the performance improvement is no longer being used when foldmethod=indent, so folds are updated multiple times during Insert mode, but only across the lines that are changing, which preserves the folds (and their open/close states) instead of recreating them.