addResizeListener bug

[Rich-Harris]

It's possible (albeit unusual) for this line to run before win has been set

[ekhaled]

This bug hit me yesterday... During a demo no less.
In my case I was destroying a component too quickly after it was instantiated, using a <svelte:component>

[ekhaled]

@Rich-Harris this still happens on iOS. However, in a slightly different form.

The <Object> gets removed by the parent on destroy, and win sticks around in this form:

It's like a weird object that looks like Window but has no removeEventListener method in it.

Are you open to fixing it like this:

- win && win.removeEventListener('resize', fn);
+ win && win.removeEventListener && win.removeEventListener('resize', fn);

if so I can send a PR your way

[Rich-Harris]

o_O

the sheer weirdness of iOS Safari bugs never ceases to astound me. That seems like a reasonable fix, yes — a PR would be great, thank you