fix: normalize paths for extract source map (cherry-pick #12825) #12847
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When Rspack's extractSourceMap passes an unnormalized path (containing .., e.g., `a/b/../c/index.js`) as `fileDependencies` to Watchpack, it triggers an unnecessary rebuild immediately after start because of the fileDependencies (unnormalized path) and the file been scanned (normalized path) string mismatch that falsely signals a `"initial-missing"` event
Deploying rspack with
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89c7df6
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| Status: | ✅ Deploy successful! |
| Preview URL: | https://faeb1fce.rspack-v2.pages.dev |
| Branch Preview URL: | https://cherry-pick-12825-to-v1-x.rspack-v2.pages.dev |
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📦 Binary Size-limit
🎉 Size decreased by 330.50KB from 48.33MB to 48.01MB (⬇️0.67%) |
Merging this PR will not alter performance
Comparing 
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LingyuCoder
approved these changes
Jan 26, 2026
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Cherry-pick of #12825 to v1.x branch.