Make use of new List widget item refresh

[Jacalz]

Checklist

• I have searched the issue tracker for open issues that relate to the same feature, before opening a new one.
• This issue only relates to a single feature. I will open new issues for any other features.

Is your feature request related to a problem?

We are currently refreshing the whole list (it probably only updates the visible items but anyhow) when we only have changed one item. Fyne v2.4.0 has a new API for refreshing an item at a specific ID. Using that would improve the performance for refreshing items.

Describe the solution you'd like to see.

We might want to keep track of the item id in the item struct and have it call refresh item. Deleting an item would have to update all of the item ids and keep some kind of lock to make sure that we don't refresh the wrong item (or crash).

[GalihFajar]

Hey @Jacalz I just worked on this one, didn't realize you were assigned 😅 . Feel free to drop my PR.

[Jacalz]

Like I stated on the PR, the approach isn't the right one unfortunately and it is a bit complicated to get right (why I removed the good-first-issue) tag. If you want me to take this on instead I can do that.

[GalihFajar]

Sure, I'll withdraw the PR instead. I didn't really get the expected solution

[Jacalz]

Sure. I hope you didn't take any offence. I'm very glad of your work and finally seeing some contributions here :)

[GalihFajar]

surely none taken 😆

[Jacalz]

I've fixed this with e546ab5 initially. Might need some more locking but I'd have to think about that to avoid introducing potential for deadlocks.