The GTK3 file chooser dialog allows you to type a filename with the keyboard. It includes an autocompletion feature that will go ahead and immediately type (not merely suggest) the rest of a file or directory name as soon as you've typed an unambiguous prefix.
This behaviour is extremely annoying for fast typists such as myself who do not want to pause for a second after every keypress to check whether the system has "helpfully" completed part of a path. For example, if I know in advance that I want to select a file on my system named /tmp/foo.pdf, I will start typing this path, but as soon as I get to the m, the dialog will automatically complete the path to /tmp/, so that by the time I type the p/, the system ends up tacking it onto the end of its own contribution: /tmp/p/ At this point (or maybe much later, if haven't yet noticed) I have to backtrack and correct things, and remind myself to type very slowly, or else to use the mouse to select the file from the list.
How can I permanently disable this autocompletion behaviour in the GTK file picker?
I know that it is in principle possible to tell GTK applications to use a different file picker (such as KDE's) using an environment variable and the xdg-desktop-portal. However, this doesn't work for every GTK application since some of them don't support the environment variable or the desktop portals.
Apart from this autocomplete annoyance, I don't mind the GTK file picker, so is there any way I can continue to have GTK applications use it, but without autocompletion?
