fix(epub): preserve word continuation when splitting CJK text on MAX_WORD_SIZE (#2652)

lib/Epub/Epub/Section.cpp

@@ -17,7 +17,7 @@ namespace {
 // v30: Arabic shaping changed both drawing and measurement (getTextAdvanceX now
 //      measures the shaped visual text); cached word positions from v29 no longer
 //      match what drawText renders.
-constexpr uint8_t SECTION_FILE_VERSION = 30;
+constexpr uint8_t SECTION_FILE_VERSION = 31;
 // Written into the version field while a build is in progress; patched to
 // SECTION_FILE_VERSION only when the build is finalized. An abandoned /
 // crash-interrupted .bin therefore carries version 0, which loadSectionFile rejects

lib/Epub/Epub/parsers/ChapterHtmlSlimParser.cpp

@@ -1154,12 +1154,14 @@ void XMLCALL ChapterHtmlSlimParser::characterData(void* userData, const XML_Char
         }
         self->partWordBufferIndex = safeLen;
         self->flushPartWordBuffer();
+        self->nextWordContinues = true;
         for (int j = 0; j < overflow; j++) {
           self->partWordBuffer[j] = saved[j];
         }
         self->partWordBufferIndex = overflow;
       } else {
         self->flushPartWordBuffer();
+        self->nextWordContinues = true;
       }
     }