Address upstream review comments

lib/KOReaderSync/ChapterXPathIndexer.cpp

@@ -77,11 +77,20 @@ bool ChapterXPathIndexer::tryExtractParagraphIndexFromXPath(const std::string& x
   }
 
   const std::string pKey = "/p[";
-  const size_t pos = normalized.find(pKey, secondBody != std::string::npos ? secondBody : 0);
+  const size_t searchStart = secondBody != std::string::npos ? secondBody : 0;
+  const size_t pos = normalized.find(pKey, searchStart);
   if (pos == std::string::npos) {
     return false;
   }
 
+  // Only accept p[...] that is a direct child of the /body segment — reject
+  // paths with intermediate ancestor segments (e.g. /body/.../div[4]/p[1])
+  // which would collapse structurally different locations to the same index.
+  const size_t bodyEnd = (secondBody != std::string::npos ? secondBody : 0) + bodyKey.size();
+  if (pos != bodyEnd) {
+    return false;
+  }
+
   const size_t start = pos + pKey.size();
   size_t end = start;
   while (end < normalized.size() && std::isdigit(static_cast<unsigned char>(normalized[end]))) {