Svelte 5: flip reordering animation glitches (REOPEN)

[hakoomen]

Describe the bug

This issue already exited(#9805) and was fixed and closed. But the animation glitches are still present and the REPLs in the original issue still have the animation problems mentioned in the issue.

Reproduction

• see the original fixed issue REPLs

Logs

No response

System Info

REPL - Svelte

Severity

blocking an upgrade

[JVariance]

Also see this example (found on Discord, code by dominikg):
Svelte 4
Svelte 5

[thebjorn]

Also see this example (found on Discord, code by dominikg):
Svelte 4
Svelte 5

I'm seeing glitches in both 4 and 5 in those examples:

Svelte 4: animation of the first element under the drag is sometimes missing a duration. To reproduce drag an element very slowly upwards, the first box drops down very fast while the rest have a pleasing slide into place. Sometimes the dragged element follows the dropping first element before bouncing back to the cursor.

Svelte 5: the banana bounces. It is originally the first element, but it continues to bounce regardless of which position it is dragged to. The drop and movement of the dragged element seems to be universally present.

[JonathonRP]

Would this also affect something like svelte 4 component animation library handling drag n drop?

[FoHoOV]

It is fixed in the latest version (v.next85) (I guess because of this?). Also closes #10675.

[hakoomen]

Yep, as @FoHoOV says it is fixed now. @trueadm maybe you want to also mention it in the release notes?