You can hover over the name to see the full path of the name.

@weinand thank you.

Could we render the full path and simple use right-aligned text ellipsis to mask the overflow?

Thanks for the suggestions however rendering the full path would give more details to an already clutterd UI imho.
Though these sketches are a good first start for a PR.

To avoid the clutter when always showing the full path we could only show those segments from the end of the path that allow to distinguish files with the same name, e.g. something like this:

foo.js
src/index.js
router/index.js
main.js

With this approach most callstacks will continue to look compact and only those with duplicate file names will need more space.

I like this idea, it goes well with some other places in the workbench where in tabs we show path of a file only if the file name is duplicated.

Oh, I didn't know that. So even better!

We now show the path segments which distinguish the sources. You can try it in tomorrow's insiders