add_filter

Description:

public void add_filter (FileFilter filter)

Adds filter to the list of filters that the user can select between.

Note:

Use [class@Gtk.FileDialog] instead

When a filter is selected, only files that are passed by that filter are displayed.

Note that the this takes ownership of the filter if it is floating, so you have to ref and sink it if you want to keep a reference.

this	a `GtkFileChooser`
filter	a `GtkFileFilter`