@Jordan Miller thanks for this very useful implementation!
This modification is very convenient and useful, especially because it allows you, if you want to search ONLY in the section you are in, not to have to select it from the advanced search.
There is only one thing I do not understand, such as email this option (to search ONLY in the topic or in the section where you are and then, everywhere) was only implemented for the desktop version and not for those who surf with smartphones ??
In practice, those who use the smartphone and are in a certain section always have to look for what interests you everywhere? It's strange don't you think?