Merging without changing the working directory

Question

I have the following scenario:

* ab82147 (HEAD, topic) changes
* 8993636 changes
* 82f4426 changes
* 18be5a3 (master) first

I\'d like to me

Answer 1

Here's sort of a cheating version.

1. git stash
2. git tag tmptag
3. git merge --no-ff topic
4. git checkout tmptag (-b tha_brunch)?
5. git stash pop
6. git tag -D tmptag