This implements a textobject corresponding to the current indentation
level of the selection(s). It is only implemented for "match mode"
bound to `i` and takes a count, where count extends the selection
leftwards additional indentation levels. Inside and Around versions are
distinguished by whether they tolerate empty lines.
* Fix multiple broken links in the documentation
* Apply code review suggestion
Co-authored-by: Michael Davis <mcarsondavis@gmail.com>
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Co-authored-by: Michael Davis <mcarsondavis@gmail.com>