Mustache Syntax is always interpreted

[antfu]

#524 seems to reoccur, I guess probably related to the MagicString rewrite

[KermanX]

Also related: Magic String always replace text against the original text, which causes external snippets to no work with other features. For example:

<<<./external.ts {monaco-run}

The monaco-run transformer works on the original text, instead of the text transformed by the snippets transformer

[antfu]

I made https://github.com/antfu/magic-string-stack for that :)