Svelte's glitchy flip animation

My Svelte application includes a list with items that feature a built-in flip animation when they are moved. Each item also contains an absolutely positioned menu with a z-index of 10. However, when the flip animation is triggered, the menu falls behind the other items. To see this issue in action, I have created a REPL:

Queries:

What is causing this bug to occur?
How can this issue be resolved?
Are there any possible workarounds?

I have tried using isolation: isolate, adjusting z-index values, and selecting the currently moved item, but nothing has effectively solved the problem so far.

Answer №1

For what reason?

The reason lies in the necessity of the transform for the animation, which creates a new stacking context incorporating the menu due to its position in the hierarchy. As a result, the z-index is relative to this new stacking context, limited to the item alone, preventing the menu from being displayed above other elements.

Solution?

To resolve this issue, avoid placing the menu within the item. Instead, elevate it higher in the hierarchy, such as directly within the <body>. Reparenting elements, possibly using an action (refer to suggestions in this topic on <body> injection), is recommended.

Adjusting the positioning may require additional steps. Utilize getBoundingClientRect to gather the necessary details for the target element.

Temporary fix?

Consider closing all menus during the animation, possibly increasing the speed as well.

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