Editor leaks memory after discarding post that contains media

[guarani]

Expected behavior

Memory usage should go down after discarding a post.

Actual behavior

Memory usage stays high after discarding a post.

Steps to reproduce the behavior

1. Create a new post
2. Use the gallery block
3. Add 50+ gifs/images

Additional information

@wargcm reported this in p1688047645788339/1688012020.214649-slack-C05CANZ2B6F, I haven't independently verified it yet.

Tested on device unknown, iOS version unknown, Jetpack iOS version unknown

[wargcm]

I made a comment about this issue here: pcdRpT-3c3-p2#comment-5352. I'm going to copy parts of it here.

After following those steps in the issue, we can grab a memgraph object by:

• ps aux | grep Jetpack.app to get the process ID
• leaks <ID> --outputGraph=Jetpack to get Jetpack.memgraph

Then with this memgraph, we can run: leaks --referenceTree --groupByType Jetpack.memgraph > tree.txt

Here's a snippet of that output:

268199 (1043M) << TOTAL >>
      40369 (487M) Jetpack __DATA __bss: 'static AnimatedImageCache.cache' 0x1082fe650 --> <NSCache 0x2e7b981c0> [48]
      + 40368 (487M) _cache --> NSCache._cache (struct cache_s)
      +   40366 (487M) calloc in _value_entry_table_resize
      +   ! 13880 (149M) AnimatedImageWrapper
      +   ! : 12804 (149M) gifData + 8 --> Swift.DataStorage

This points to AnimatedImageCache holding onto this memory.

[kean]

Closing because:

1. AnimatedImageCache was removed in Feature Branch 25.7 #23923. The entire loading/caching infrastructure with a few minor exceptions was consolidated in one place.
2. This is no longer relevant for the new editor that will run out of process