recent-ish GTK changed the filter-thing (find by typing the start of the filename) in the Open dialog to a full-blown search.
I don't like it.
The search is much slower on my machine, and it shows less relevant files from subdirectories. Even worse is that the search doesn't work on SFTP shares, which means when I want to find a specific file I can't use the search and I don't have the filter, so I have to manually scroll through a list of hundreds of files... I end up giving up on using a GUI app to edit the file and use vim instead.
I understand that my workflow is not a common one, and that it works well for most people, so I doubt reporting a bug about this is even worth it.