scripts/specialize-patch: Rebuild filtered hunks - #388
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The regression became visible after commit 9151760 ("scripts/generate-kernel-patch: Preserve split patches") preserved split output that had previously been empty without diffstat. specialize-patch kept the original hunk coordinates after dropping version-dependent lines, so GNU patch rejected the generated qla.h patch. Recalculate hunk coordinates and context after specialization removes added lines. This prevents GNU patch from rejecting QLogic qla.h hunks for Linux 7.1 and 7.2. Add a focused regression test for the normal and matching-line-number specialization modes.
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The regression became visible after commit 9151760 ("scripts/generate-kernel-patch: Preserve split patches") preserved split output that had previously been empty without diffstat. specialize-patch kept the original hunk coordinates after dropping version-dependent lines, so GNU patch rejected the generated qla.h patch.
Recalculate hunk coordinates and context after specialization removes added lines. This prevents GNU patch from rejecting QLogic qla.h hunks for Linux 7.1 and 7.2.
Add a focused regression test for the normal and matching-line-number specialization modes.