Add to Quick Favourites directly from Operator Search

The operator search menu is currently a lacking right-click context menu, which means that we can't add items to Quick Favourites, or add shortcuts directly from search results. In my opinion, the operator search menu is the most useful place to have the ability to add to Quick Favourites, as some operators are not available in the UI, or just hidden in an obscure place, so it is often much easier to just search for them.

Note: This is almost the same as this suggestion to add the assign shortcut function to the search menu, but I am suggesting the ability to add quick favourites too. Perhaps it would have been better to suggest under the original proposal? In any case, they are related.