I have `LazyColumn` that I pass list of items into. I want to update items, new list with appended i...

# compose

[Marko Novaković]

I have LazyColumn that I pass list of items into. I want to update items, new list with appended items, every second of so. when new items are received LazyColumn flickers and resets scroll to top.
this happens even when I’m using ImmutableList and having item key defined.
how can I append items without flicker and moving to top?

[Anum Amin]

Does your code remember scroll state of LazyColumn?

[Marko Novaković]

yes it does. but even if that works there is flicker issue also

[Sean Proctor]

Are you using keys?

[Sean Proctor]

I'm blind, sorry.

[Sean Proctor]

Can you paste a code snippet?

[Kaanixir]

you need to override the hashCode() and equals() of the items that are getting diff'ed, which is what's causing the flicker I think, it's not just the keys.

If these items are complex objects, properly implemented hashCode() and equals() methods help Compose efficiently identify changes

you need to help it identify content or instantiation differences (one is a structural / partial difference, the other is difference in entire object itself )

this used to be a part of the DiffUtil process too

[Kaanixir]

either that or your keys are not unique or not properly tied to the item's identity (key) (you need to make sure each item has a unique key and they're not all the same )

[Marko Novaković]

@Sean Proctor it’s pretty basic code. flow that emits new list with appended elements every second and the most basic LazyColumn you can imagine 😄

[Marko Novaković]

btw. nothing worked. keys are unique, overriding hash and equals didn’t do anything 🤷‍♂️

[Sean Proctor]

Can you make a small reproduction? It shouldn't flicker, so there's something specific about your code.

[Marko Novaković]

I will