fix: avoid writing to state in media-query getter #122
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This was referenced Jul 27, 2024
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This fixes a bug someone opened in the svelte repo but it was actually our (namely my lol) bad.
EDIT: oh they also reported here... Closes #121
sveltejs/svelte#12571 (comment)
We should avoid writing to state in the getter but we can just leave the state undefined and return the actual value from mediaQuery list (it will still be reactive from the moment we register the listener since we are still accessing the signal to check if it's undefined).
EDIT: i've also changed effectRegistered to a number to handle the case where multiple components that access the same instance of the class mount in the same tick.