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85c6e04f44
This PR fixes an issue where strings in the Pug and Slim pre-processor
were handled using the `string_machine`. However, the `string_machine`
is not for strings inside of Tailwind CSS classes which means that
whitespace is invalid.
This means that parts of the code that _are_ inside strings will not be
inside strings and parts of the code that are not inside strings will be
part of a potential string. This is a bit confusing to wrap your head
around, but here is a visual representation of the problem:
```
.join(' ')
^ 3. start of new string, which means that the `)` _could_ be part of a string if a new `'` occurs later.
^ 2. whitespace is not allowed, stop string
^ 1. start of string
```
Fixes: #16998
# Test plan
1. Added new test
2. Existing tests still pass
3. Added a simple test helper to make sure that we can extract the
correct candidates _after_ pre-processing
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