Meta tags with same name attribute but different other attributes will be overwritten

[GoodbyeNJN]

For example, use the following two tags:

<Meta name="theme-color" media="(prefers-color-scheme: light)" content="#fff" />
<Meta name="theme-color" media="(prefers-color-scheme: dark)" content="#000" />

Only the latter will actually be rendered.

The problem lies here:

solid-meta/src/index.tsx

Lines 156 to 170 in c9d21ef

	actions.addServerTag = (tagDesc: TagDescription) => {
	const { tags = [] } = props;
	// tweak only cascading tags
	if (cascadingTags.indexOf(tagDesc.tag) !== -1) {
	const index = tags.findIndex(prev => {
	const prevName = prev.props.name || prev.props.property;
	const nextName = tagDesc.props.name || tagDesc.props.property;
	return prev.tag === tagDesc.tag && prevName === nextName;
	});
	if (index !== -1) {
	tags.splice(index, 1);
	}
	}
	tags.push(tagDesc);
	};

This function seems to remove duplicate tags, but only name or property attributes are compared when checking whether they are duplicates.

I suppose to sort props by key and then serialize it as the unique key of a tag for comparison.

[DaniGuardiola]

This fix broke my website's open graph meta tags.

I had a top level set of meta tags with default, e.g.

<Meta name="og:image" property="og:image" content="default.png" />

And I used child meta tags to override it, e.g.

<Meta name="og:image" property="og:image" content="actual-image.png" />

It worked fine. However, due to this change, it now doesn't override the tag, and both are shown at the same time, causing tools reading the open graph tags to use the first one and not the correct one.

This is because the key now is different for both:

// first key
'meta{"content":"default.png","name":"og:image"}'

// second key
'meta{"content":"actual-image.png","name":"og:image"}'

[GoodbyeNJN]

@DaniGuardiola Sorry for breaking existing features while fixing this issue.
I'm reorganizing the attributes of meta element and plan to list out a separate test case for meta element first.
Once a separate test case for meta element is approved by the maintainer, I would re-fix this issue.

[DaniGuardiola]

@GoodbyeNJN it's okay, shit happens :)

See #39 - I think the cascading/overriding effect should just be completely explicit and opt-in because the heuristics get too complicated otherwise.