TextEditor: Fix handling of multiline text for code assistant

Task-number: QTCREATORBUG-8544
Change-Id: Ic0cffe941309ee38cc62111960c5ddad46025a8c
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/plugins/texteditor/convenience.cpp

@@ -61,7 +61,8 @@ QString textAt(QTextCursor tc, int pos, int length)
     tc.setPosition(pos);
     tc.setPosition(pos + length, QTextCursor::KeepAnchor);
 
-    return tc.selectedText();
+    // selectedText() returns U+2029 (PARAGRAPH SEPARATOR) instead of newline
+    return tc.selectedText().replace(QChar::ParagraphSeparator, QLatin1Char('\n'));
 }
 
 } // Util