Re: [PATCH v2 00/10] sparse-checkout: make set subsume init

> As described at [1], the split of init and set subcommands in
> sparse-checkout causes multiple issues:
> 
>  * Poor performance (deleting all tracked files, then later restoring many
>    and maybe even most of them)
>  * Poor UI (multiple progress bars in wrappers that hide both commands under
>    1 user-facing command)
>  * Loss of ignored files under directories the user wanted to keep
> 
> This series fixes this bug by providing a single command to switch to a
> sparse-checkout: set. It does so by making set able to do the combined work
> of init and set. It keeps init as-is to give folks time to adapt, but marks
> it as deprecated. It also makes reapply able to toggle cone/non-cone mode
> and sparse-index/non-sparse-index mode.
> 
> Changes since v1:
> 
>  * Inserted new patches 3 & 4 as additional preparatory cleanups
>  * Took the new mode-toggling work code in sparse_checkout_set from the
>    previous series and moved it into a new function, as a preparatory patch,
>    and made it usable by init/set/reapply
>  * Also updated reapply to allow mode-toggling
>  * Updated the documentation as per above
>  * Various other small items from review comments