Re: [vim/vim] `expand()` and `expandcmd()` behave differently on `%:~` (Issue #20793)

h-east left a comment (vim/vim#20793)

@EdwinChan 
One practical note now that this is closed: `%:~:s?\~?/app?` already does what
you want, in `'makeprg'` and in a `:!` command as well, without hardcoding
`$HOME`.

That follows from the two steps. The whole modifier chain is consumed in step
1, since `eval_vars()` passes `:~:s?..?..?` to `modify_fname()`. Once your
`:s` has removed the `~`, step 2 finds neither a `~` nor a `$` in the result
and leaves it alone. This is also why `%:p` and `%:h` look unaffected: they
take the very same path, they just never produce a `~` for step 2 to act on.

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