Code review comment for ~3v1n0/ubuntu/+source/nautilus:ubuntu/master-xubuntu-cancel-search

This looks mostly good, I have some nitpicks and some questions (see below and inline diff):
* You didn't metnion at all about the ignore_partial_results which leads to 2 different conditions (we want to ignore them or not). I think that ought some mention in the patch description.
* I'm unsure to understand what the meta_requests are and why they are treated differently (and unconditionnally). Is it a queue before them becoming the current requests, and this is why you are cancelling if the invocation caller matches as well?