fix: remove memory leak from retaining old DOM elements #11197
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trueadm
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This was an interesting one to fix, happy to take feedback on tweaking the implementation.
Today, we have a common memory leak retaining DOM elements with fragment templates. The block effect has
domproperty with is just the[...fragment.childNodes]and that might seem innocent, but it's actually quite the opposite. That's because the template fragment we clone is populated as render effects and other logic blocks consequently add content to the fragment as we go (each blocks, if blocks etc). If that content gets cleared, it's never removed from thedomarray and is stored forever.We don't need to do this though. Instead we can capture the effect
domat the start of the template and only push into template nodes which we no belong only to that given effect. That means we stop pushing in DOM elements from other blocks – with the exception of HTML and dynamic elements – which don't get their own template.I also encountered a bug in the existing system with dynamic HTML blocks in each blocks. This PR also fixes that too!