Order is wrong for keyed each block with outros

[Rich-Harris]

No REPL demo until #525 is released, but if you have a situation like this...

{{#each things as thing @name}}
  <div out:fade>{{thing.name}}</div>
{{/each}}

...then when you remove an item from the middle of things, the corresponding DOM node jumps to the top of the list. That's because Svelte mounts all iterations that correspond to the current value of things, in order, to whatever the anchor node is — it doesn't mount outroing nodes, with the effect being that everything preserved or created appears below everything outroing.

There isn't really a neat solution to this — instead we'll need to implement #373.

[Rich-Harris]

This is mostly fixed in 1.20 — REPL. However it seems that if you bash the 'randomise' button in the example enough times, you can get into a corrupted state (one of the letters on the left hand side will stick around when it should have been removed). Haven't yet managed to create a minimal repro that we can work with — if anyone is able to, that would be a huge help!

[Rich-Harris]

I think this might have been fixed by some of the recent work on transitions, I can no longer reproduce it. Will be optimistic and close it