Component template content: html encoded chars in attributes are not properly decoded

[chessydk]

Version

2.5.17

Reproduction link

https://codepen.io/chessydk/pen/ZqGqbr?editors=1010#0

Steps to reproduce

Hover over the "æøå".

What is expected?

I would expect html attributes to be html-decoded, just like text-nodes, so when you hover over the text you should see "æøå"

What is actually happening?

You see "æøå"

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Context: Serving html from CMS backend as JSON and creating dynamic Vue component with the server-generated html, which can have danish characters in attributes (mostly in object-data bindings like :model="{prop: æøå}" , but the problem exists for all attributes.

[Justineo]

Duplicate of #8805