Describe the bug

After updating to the latest master, the following warning started to appear:

To Reproduce
Steps to reproduce the behavior:

1. Open Ruffle (the newest code from master https://github.com/ruffle-rs/ruffle, should be available tomorrow as a nightly release)
2. Expand "Movie Parameters"
3. Move your mouse

Expected behavior

No warning

Desktop (please complete the following information):

• OS: Fedora
• Browser N/A
• Version 40

Additional context

That started happening after upgrading from f4697bc to e0f0b7f. Possibly related to #5059

Here's the related code in Ruffle: https://github.com/ruffle-rs/ruffle/blob/309d600c6daa400ac02d8aff5ee60d0cda670f6c/desktop/src/gui/dialogs/open_dialog.rs#L537. It started happening after ruffle-rs/ruffle#17987

CC @torokati44