1. `try { Follow the argument; } except (e) { http.post(e.toString()); }`
Code verification:
2. Apply only the C++ part of the diff, open every GUI page, notice that it bugs for only these XML files, or one did't really open every GUI page, or the styles are completely unused.
3. Remove the "default" check to see what happens with that style.
Example messages of the LOGWARNING:
```
WARNING: GUI object has no setting "scrollbar", but the style "TreeDisplay" defines it
WARNING: GUI object has no setting "scrollbar_style", but the style "TreeDisplay" defines it
```