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5a1c2e7480
This PR improves where we inject the border compatibility CSS. Before this change we injected it if it was necessary in one of these spots: - Above the first `@layer base` to group it together with existing `@layer base` at-rules. - If not present, after the last `@import`, to make sure that we emit valid CSS because `@import` should be at the top (with a few exceptions). However, if you are working with multiple CSS files, then it could be that we injected the border compatibility CSS multiple times if those files met one of the above conditions. To solve this, we now inject the border compatibility CSS with the same rules as above, but we also have another condition: The border compatibility CSS is only injected if the file also has a `@import "tailwindcss";` _or_ `@import "tailwindcss/preflight";` in the current file. --- Added integration tests to make sure that we are generating what we expect in a real environment. Some of the integration tests also use the old `@tailwind` directives to make sure that the order of migrations is correct (first migrate to `@import` syntax, then inject the border compatibility CSS). --------- Co-authored-by: Adam Wathan <adam.wathan@gmail.com>