[Development] how to include further changes while previous commit is still under review?

[Daniel Savi]

Hello qt devs

I'm back with another newbie question. I have committed a patch that is 
still under review on gerrit.

Meanwhile, I've got a local and unrelated patch on the same file, that I 
would like to commit, too.

Now, how would I include this patch into my local git repo and how would 
I commit it as a separate patch to the first?

How could I still work on the first patch, once more comments are coming in?

Would I create separate branches?

Sorry for my very basic level of git-foo.