Gets the filename that should be previewed in a custom preview
widget. See gtk_file_chooser_set_preview_widget().
Return: the filename to preview, or %NULL if
no file is selected, or if the selected file cannot be represented
as a local filename. Free with g_free()
Gets the filename that should be previewed in a custom preview widget. See gtk_file_chooser_set_preview_widget().
Return: the filename to preview, or %NULL if no file is selected, or if the selected file cannot be represented as a local filename. Free with g_free()