Svelte 5: is removeEventListener necessary for bindings?

[Rich-Harris]

Describe the problem

While reviewing #11271, I noticed that we're calling addEventListener for certain bindings without an accompanying removeEventListener. At first I thought we should probably add the removeEventListener, but then it occurred to me that the event listeners exist for the full lifetime of the element — after it gets removed from the DOM, it should be GC'd along with its event handlers.

Is that true though? Is it safe not to remove event listeners?

Describe the proposed solution

We should do one of two things:

1. Remove event listeners, if we do in fact need to
2. More likely, we can remove some redundant removeEventListener calls, making the library a tiny bit leaner

Importance

nice to have

[dummdidumm]

It is indeed unnecessary to call removeEventListener in that case, but our code is already optimal with regards to that - no unnecessary calls for any bindings.