Tile Animation Editor may not show additional tiles if source image resized

[kiddkaffeine]

Describe the bug
If the source image underlying a tileset is updated, Tiled will generally reflect that. However, if a vertically larger image is loaded in, the tiles on the bottom will not appear in Tile Animation Editor (the movie camera icon) until the tileset is closed and re-opened.

To Reproduce

1. Create a tileset with a given size.
2. Replace the underlying image with one that is taller.
3. Click on the Tile Animation Editor (movie icon)
4. Attempt to select tile from the new section at the bottom

Expected behavior
New tiles are available.

Media
N/A

Specifications:
Verified using Tiled 1.10.2 on MacOS.