Stash individual file

[iloveitaly]

Is your feature request related to a problem? Please describe.
Attempting to pull upstream changes and reduce conflicts

Describe the solution you'd like
S providing an option to add an individual file to a new git stash or amend the last stash in the stack

Describe alternatives you've considered
Adding files to staging and then stashing them.

Additional context
Add any other context or screenshots about the feature request here.

[stefanhaller]

I feel that it's not necessary to add this, since it's already possible by staging the files you want to stash and then hitting S s. This has the advantage that it works for any selection of files (or even individual hunks within a file), whereas your proposal would only work for single files or contiguous multiselections.

[mark2185]

And this is a great example of something that could be solved by a custom command.