fix: The needsMask check should also be ignored when the childNode array length is equal to 0 #1402
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…ray length is 0 When checking needsMask, the n.hildnode is not rigorous and the array length is greater than 0, thus ignoring the leaf component
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@Paulhejia looks like this breaks in certain cases (see failing tests), could you fix them? |
eoghanmurray
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Jun 17, 2024
…ements' optimisation wasn't being applied as `n.childNodes` was always truthy even when there were no childNodes. Changing it to `n.childNodes.length` directly there (see rrweb-io#1402) actually caused a bug as during a mutation, we serialize the text node directly, and need to jump to the parentElement to do the check. This is why I've reimplemented this optimisation inside `needMaskingText` where we are already had an `isElement` test
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Thanks @Paulhejia |
eoghanmurray
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Jun 17, 2024
* Minor fixup for #1349; the 'we can avoid the check on leaf elements' optimisation wasn't being applied as `n.childNodes` was always truthy even when there were no childNodes. Changing it to `n.childNodes.length` directly there (see #1402) actually caused a bug as during a mutation, we serialize the text node directly, and need to jump to the parentElement to do the check. This is why I've reimplemented this optimisation inside `needMaskingText` where we are already had an `isElement` test Thanks to @Paulhejia (https://github.com/Paulhejia/rrweb/) for spotting that `Boolean(n.childNodes)` is aways true.
jeffdnguyen
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Jul 29, 2024
* Minor fixup for rrweb-io#1349; the 'we can avoid the check on leaf elements' optimisation wasn't being applied as `n.childNodes` was always truthy even when there were no childNodes. Changing it to `n.childNodes.length` directly there (see rrweb-io#1402) actually caused a bug as during a mutation, we serialize the text node directly, and need to jump to the parentElement to do the check. This is why I've reimplemented this optimisation inside `needMaskingText` where we are already had an `isElement` test Thanks to @Paulhejia (https://github.com/Paulhejia/rrweb/) for spotting that `Boolean(n.childNodes)` is aways true.
jeffdnguyen
pushed a commit
to pendo-io/rrweb
that referenced
this pull request
Jul 29, 2024
* Minor fixup for rrweb-io#1349; the 'we can avoid the check on leaf elements' optimisation wasn't being applied as `n.childNodes` was always truthy even when there were no childNodes. Changing it to `n.childNodes.length` directly there (see rrweb-io#1402) actually caused a bug as during a mutation, we serialize the text node directly, and need to jump to the parentElement to do the check. This is why I've reimplemented this optimisation inside `needMaskingText` where we are already had an `isElement` test Thanks to @Paulhejia (https://github.com/Paulhejia/rrweb/) for spotting that `Boolean(n.childNodes)` is aways true.
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When checking needsMask, it is not rigorous to determine whether n.childNode exists, but also to determine whether the array length is greater than 0