config file format in gtk3

[José Luis Lafuente <jlesquembre gmail com>]

Hi,

I'm trying to understand how the config files work for gtk3. I have a file at `~/.config/gtk-3.0/settings.ini, and I think that the options I can use here are the properties from here:

https://developer.gnome.org/gtk3/stable/GtkSettings.html

What I want to do is to customize file chooser dialog. It seems that the options for that are here:

https://developer.gnome.org/gtk3/stable/GtkFileChooser.html

but I cannot figure which is the proper format to set the `show-hidden` setting to true on the `settings.ini` file.

Also, I cannot find what the setting name for the `Sort folders before files` option.

Thanks