Breadcrumbs/symbols repeating in svelte files

[mattdw]

I'm seeing some pretty pathological problems in the breadcrumbs/symbol bar at the top of a file (and in scrolling performance as a result.) For some reason as I navigate around in a style section, it repeats css names more and more. So given a style section like

<style>
.wrapper::after {
   display: block;
}
</style>

My symbol/breadcrumbs bar initially reads:

[filename].svelte > .wrapper::after > .wrapper::after

Then after moving around and coming back (but I can't reliably trigger it, or figure out what is triggering it):

[filename].svelte > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after

Then yet later:

[filename].svelte > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after > .wrapper::after

(By this point scrolling/typing performance has slowed to an unusable crawl.) Not sure if this is an extension bug or a Zed bug, but I haven't seen it in .ts or .css files.

Things I've noticed:

• no problems in HTML or <script> sections.
• I get the same behaviour (e.g. same number of repeats) for all selectors in the <style> tag - whether classes, elements, pseudoclasses or selector lists.
• The base case seems to be just the one duplication e.g. [filename].svelte > .myclass > .myclass. I've never seen it with only one copy - it's always at least doubled.
• If I can trigger any more repeats than that it's likely to grow uncontrollably.

Thanks for the extension! Other than this problem, first impressions were really good!