After all, such patches were removed from Nautilus for a good reason. It should also be removed from the file chooser, since currently it breaks both behaviors. Both search and type ahead are currently broken, by removing this, at least search will work, which is the upstream behavior.
I'd say the solution is to remove the restore_ filechooser_ typeaheadfind. patch, see this commit:
https:/ /git.launchpad. net/ubuntu/ +source/ gtk+3.0/ commit/ ?id=99cb6330706 eadb58bf9d3c5b7 7120fdd5971189
After all, such patches were removed from Nautilus for a good reason. It should also be removed from the file chooser, since currently it breaks both behaviors. Both search and type ahead are currently broken, by removing this, at least search will work, which is the upstream behavior.