[fix]: keep space in <pre> or preserveWhitespace: true

[ota-meshi]

close #6437
close #4731

This PR fixes to keep the space inside the <pre> tag. Also, if the user uses the preserveWhitespace: true option, it will keep the space in the same way with or without the <pre> tag.

The previous compiler removes the spaces after the start tag and before the end tag. It works fine in most cases, but it doesn't output as intended inside the <pre> tag.

However, even after this fix, the space remains removed inside the mustache tag. This is intentional because I think that outputting a lot of space with {#each} etc. may be included in the breaking change.

There's already a PR #4737 about fixing preserveWhitespace: true, but it didn't seem to be active.

Before submitting the PR, please make sure you do the following

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
• Prefix your PR title with [feat], [fix], [chore], or [docs].
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests

• Run the tests with npm test and lint the project with npm run lint

[ota-meshi]

I fixed tests that was failing due to crlf on windows. Would you please run the tests again?

[ota-meshi]

I don't know how to fix the CI timeout. Can you let me know how to solve it?

[dummdidumm]

It's unrelated, don't worry about it

[dummdidumm]

Code change looks great 👍 Could you replace the test in test/js with a runtime test inside test/runtime? You could check the rendered output via target.querySelector('something something').innerHTML. The advantage would be that these tests are more robust to compiler implementation changes and need less adjustments later on.

[ota-meshi]

Thank you for checking this PR! I will make that change.