Address nested slot issues (light DOM) #5
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1. Keep track of slots on connectedCallback() and then unwind them symmetrically on disconnectedCallback() to handle state/initialization bugs in case nested elements render from inside out 2. Ensure we restrict selection of slots only to the current element and not nested elements (i.e. from inverse perspective: traverse DOM up from slot and ensure nearest custom element is the current one being initialized).
… and unnamed slots (i.e. elements without "slot" attrib) to coexist, which is what Svelte already does. Throw error in edge case if named slots (including a named slot="default") exists with still some unnamed content/elements remaining.
…ive) debugging during package development.
…re importantly helped with debugging an issue (edge case triggered when editing in DevTools)
…n't result in selecting the wrong slots. Using direct node equality to verify that the provided slot's parent belongs to the parent currently being processed. Also documenting interesting edge case (which hopefully doesn't come up in normal use, but if it does, will have some idea of what might be happening)
… be reused later (e.g. MutationObserver's for IIFEs executed prior to parsing of the light DOM elements)
…es for easier management/reference (also quicker tests). Using "test()" function instead of "it()" due to now they're already named anyway.
…itly named default conflicts with remaining content left over. Also: Renaming top level describe()'s
…ir own slots and not conflicting with slots lower down, or, that slots lower down aren't applied to custom element tags higher up, etc.
…t/outer elements will retain their state (slots) if outer element happens to render AFTER.
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Fix for crisward/svelte-tag#7. Primary changes