there is a tool called everything by voidtools (david carpenter), and I tend to use it a lot with the file manager
it would be nice if there was a built-in search functionality that was fast, lightweight and open-source (unlike the aformentioned tool)
there is an open-source tool called SwiftSearch that is very similar to Everything, but it doesn't offer drop-and-drop (DDE) with other windows.
https://sourceforge.net/projects/swifts ... ion%207.2/
https://sourceforge.net/p/swiftsearch/c ... ster/tree/
except the multiuser security issues (https://en.wikipedia.org/wiki/Everythin ... r_security), it would be a nice addition to the file manager.