Great!

Commited the fix , tagging it with the wrong task, but here is the fix to review.

It changes the proportions of IV and Video, so that 16:9 videos shows without a scrollbar.

The bug in the code is fixed, well done.

But the main issue here is the how videos are displayed inside the dialog. Previously, they were scaled to fit, like the images still are, like this:

Now it looks like this:

Perhaps there's some if statement no longer evaluating correctly?

if posters still work it isn't a blocker, but it definitively needs to be fixed now.