Using git, how do you reset the working tree to the state of the index?

Question

Situation:

1. Edit files
2. Add files to the index
3. Edit more files

Now we have three different states. The state of HEAD, the state

Answer 1

You can use git stash save --keep-index to do this. After saving the stash, you can use git stash drop if you don't want to keep it around.