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Closes #17508 This PR fixes another issue we found that caused dev builds with Next.js and Turbopack to resolve the CSS file that was saved one revision before the latest update. When debugging this we noticed that the PostCSS entry is called twice for every one update when changing the input CSS file directly. That was caused by the input file itself being added as a _dependency_ so you would first get the callback that a _dependency_ has updated (at which point we look at the file system and figure out we need a full-rebuild because the input.css file has changed) and then another callback for when the _input file_ has updated. The problem with the second callback was that the file-system was already scanned for updates and since this includes the `mtimes` for the input file, we seemingly thought that the input file did not change. However, the issue is that the first callback actually came with an outdated PostCSS input AST... We found that this problem arises when you register the input CSS as a dependency of itself. This is not expected and we actually guard against this in the PostCSS client. However, we found that the input `from` argument is _a relative path when using Next.js with Turbopack_ so that check was not working as expected. ## Test plan Added the change to the repro from #17508 and it seems to work fine now. https://github.com/user-attachments/assets/2acb0078-f961-4498-be1a-b1c72d5ceda1 Also added a unit test to ensure we document that the input file path can be a relative path. Co-authored-by: Robin Malfait <malfait.robin@gmail.com>
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