Fixed too much text being copied when copying chat messages (#4812)

* fix: selection copying too much

* chore: add changelog entry

* Update changelog entry

---------

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/widgets/helper/ChannelView.cpp

@@ -609,6 +609,11 @@ QString ChannelView::getSelectedText()
                       : layout->getLastCharacterIndex() + 1;
 
         layout->addSelectionText(result, from, to);
+
+        if (msg != indexEnd)
+        {
+            result += '\n';
+        }
     }
 
     return result;