Configure whitespace-sensitive tags

Related to #24, whitespace-sensitive tags should not be modified on format. For example, this

    <pre>foo
bar baz</pre>

becomes this

    <pre>foo bar baz</pre>

I would also like to be able to configure custom tags to follow the same rules as the <pre> tag. For example, if I configure the CodeSnippet tag to be whitespace-sensitive, this should not change after formatting:

    <CodeSnippet lang="js">const foo = () => {
  return 42
}</CodeSnippet>

[ourway]

It is a major issue for me write now, I am not able to format the code without breaking typography and other elements.

[dummdidumm]

The pre-issue was fixed a while ago. Since prettier-plugin-svelte version 2.0.0, only known block elements such as div or p are formatted as whitespace-insensitive. Since 2.1.0, the htmlWhitespaceSensitivity option is supported, which means you can chose yourself if you want known block elements, all or none treated as whitespace sensitive. If you want to break out of the behavior for certain tags or want to leave the contents untouched (for example in that CodeSnippet case), use <!-- prettier-ignore -->. These options are enough to tweak the setup as desired, therefore I’m going to close this issue.