fix: always use document.importNode for template cloning #11592
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Fixes #11589. It's a shame we can't use
Node.prototype.cloneNode
because it generally offers better performance, but at the tradeoff with issues around FF and lazy images, not to mention shadow DOM and custom elements.In terms of overhead,
cloneNode
is about 30% faster thanimportNode
in my local testing.Additional Context: solidjs/solid#1828