fix: iterate all blocks

refactor: block iteration loop

refactor: replaced checks with chop()

src/chatlog/content/text.cpp

@@ -337,8 +337,10 @@ QString Text::extractSanitizedText(int from, int to) const
         return "";
 
     QString txt;
-    QTextBlock block = doc->firstBlock();
 
+    QTextBlock begin = doc->findBlock(from);
+    QTextBlock end = doc->findBlock(to);
+    for (QTextBlock block = begin; block != end.next() && block.isValid(); block = block.next()) {
         for (QTextBlock::Iterator itr = block.begin(); itr != block.end(); ++itr) {
             int pos =
                 itr.fragment()
@@ -363,6 +365,11 @@ QString Text::extractSanitizedText(int from, int to) const
             }
         }
 
+        txt += '\n';
+    }
+
+    txt.chop(1);
+
     return txt;
 }