Common library code for other vc*.nvim projects.
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Not sure how long this should be kept, but I guess it doesn't hurt much.
Tl;dr: With plain `vim.wo`, newly opened buffers in the window would
inherit the fold settings. This manifested as
* Open file in buffer.
* Toggle folds on.
* Open another file in a new buffer in the same window.
* The new buffer would have folds enabled.