As a more nuanced interpretation: If one looks at the green lines, it's more about Linus "editing some existing cpp and h files".<p>If there are green lines showing Linus originating new code with "class xyz : superABC {};" ... that would be more interesting. :-)<p>For some more context of the diving software, there's a video presenting the rationale for migrating from Gtk to Qt:<p><a href="https://www.youtube.com/results?search_query=gtk+qt" rel="nofollow">https://www.youtube.com/results?search_query=gtk+qt</a>