[@mantine/core] Image: fix possible permanent placeholder after hydration

[Stouffi]

This PR fixes #629

[rtivital]

Is there any reason to change node version?

[Stouffi]

I was stuck with an error stating that a dependency required node >= 14.17 during my first yarn install

[rtivital]

Alright, then let's leave it in 14.17 then

[rtivital]

Thanks for a PR, have you tested it to work in ssr environment, e.g. in next template?

[Stouffi]

@rtivital I encountered the issue with my stack which is viteJS + SSR and with the fix, the problem with placeholder disappeared.

[rtivital]

Okay, I'll run some more tests with it then

[Stouffi]

Oh btw, did you mean testing manually with other SSR environment? I couldn't figure out how to add a test with an html string and an hydration using @testing-library/react in src/mantine-core/src/components/Image/Image.test.tsx

[rtivital]

Yes, I do not think it is possible to check it within jest-dom environment, so it should be checked manually at least in Next.js

[rtivital]

I've checked with next, it works fine