Flipbook viewer: adding a favourite changes the viewer size

[eatyourgreens]

Package

• lib-classifier

Describe the bug

There's a weird glitch in the flipbook viewer where adding/removing a favourite changes the size of the viewer, including showing/hiding the labels on the player controls.

Screen.Recording.2024-11-04.at.17.05.33.mov

To Reproduce

This is pretty easy to reproduce by favouriting a photo on Squirrel Mapper, for any subject that uses the flipbook viewer.

This is the subject from the screen recording: https://www.zooniverse.org/projects/bcosentino/squirrelmapper/classify/workflow/20808/subject/103863212

Expected behavior

The subject and toolbar should stay the same size, I guess.

Device information

Firefox 132 on a MacBook (Sonoma 14.7.1)

Additional context

Could be related to #6275.