A button that launches a file chooser dialog.
The button contains an area that displays the file name of the current file selected and also displays a button that allows the user to launch a file selection dialog. After the dialog is launched, the button is immediately associated to the new file selected by the user.
GtkFileChooserButton is only for selecting files or folders. It cannot be used for saving files.
GtkFileChooserButtonGtkFileChooserButton::new_with_backend (title, action, backend);--