gtk:file-dialog-select-multiple-folders (dialog parent cancellable func)

dialog -- a gtk:file-dialog object
parent -- a gtk:window parent window
cancellable -- a g:cancellable object to cancel the operation, the argument can be nil
func -- a g:async-ready-callback function to call when the operation is complete, the argument can be nil

This function initiates a multi-directory selection operation by presenting a file chooser dialog to the user. The file chooser will initially be opened in the initial-folder directory. The callback will be called when the dialog is dismissed. It should call the gtk:file-dialog-select-multiple-folders-finish function to obtain the result.

Since 4.10