[GTK4] Migrate DirectoryDialog from GtkFileChooser to GtkFileDialog #1473
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The FileChooser has been marked as deprecated with GTK 4.10 with the FileDialog being its replacement. Using this new API poses a challenge, as it requires the usage of the AsyncReadyCallback mechanism in order to respond to the closure of the dialog.
Once the dialog has been opened via gtk_file_dialog_select_folder(), it is necessary to call gtk_file_dialog_select_folder_finish() from within the callback method. This method also returns the selected folder, which has to be cached until after the dialog has been closed.
Following native methods have been added to GTK4: