GtkFileChooserNative: ACTION_CREATE_FOLDER doesn't work as intended on win32

Submitted by Lukas

Description

When specifying GTK_FILE_CHOOSER_ACTION_CREATE_FOLDER, it's not possible to actually create a new folder. The Dialog only allows selecting existing folders.

I think Gtk is running into a similar issue as https://stackoverflow.com/questions/8336312/allowing-ifileopendialog-to-pick-a-folder-that-doesnt-exist-yet

My non-exhaustive research seems to indicate that the intended functionality isn't available in the win32 api.

Version: 3.22.x