I know this might be a very basic question about SVN, but it's hard to search for it with few words.

Let's say I'm working on a ticket `#2015` where I had to make changes in the files `index.html` and `app.js`, but for some reason this ticket is now impeded and I'm waiting for something so I can continue to work on it.

So to not be idle, now I will start to work on ticket `#2047` let's say, which will include changes to file `blue-theme.css` and also `index.html`.

Assuming that I'm working with Subversion, which are the most appropriate operations I could use to not lose my work on ticket `#2015`, but also not commit those changes to file `index.html` as if they belong to ticket `#2047`?