why fileChooserButton unsupport GTK_FILE_CHOOSER_ACTION_SAVE action?



why fileChooserButton unsupport GTK_FILE_CHOOSER_ACTION_SAVE action?
I wanna create a export assistant, let user select exporting file name, but i see the fileChooserButton unsupport GTK_FILE_CHOOSER_ACTION_SAVE action, i like look and feel of fileChooserButton, is there has similar widget?



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