fix: fix the analysis in the unparser experiment

Author: eugen-shulimov

src/main/java/org/variantsync/diffdetective/experiments/thesis_es/UnparseAnalysis.java

@@ -38,8 +38,8 @@ public boolean analyzeVariationDiff(Analysis analysis) throws Exception {
         String textDiff = patch.getDiff();
         String codeBefore = "";
         String codeAfter = "";
-        codeBefore = Files.readString(Path.of(patch.getFileName(Time.BEFORE)));
-        codeAfter = Files.readString(Path.of(patch.getFileName(Time.AFTER)));
+        codeBefore = VariationUnparser.undiff(patch.getDiff(), Time.BEFORE);
+        codeAfter = VariationUnparser.undiff(patch.getDiff(), Time.AFTER);
         codeBefore = codeBefore.replaceAll("\\r\\n", "\n");
         codeAfter = codeAfter.replaceAll("\\r\\n", "\n");
         boolean[][] diffTestAll = runTestsDiff(textDiff);