Some of the constants belong definitely to the ui domain, like `MAX_DISPLAYED_CHILDREN_PER_NODE`. They should stay in that package. Some others are used only inside the utils package (default values) and they should stay here. There is a third group that I am not sure about, like EQUIVALENCE_CLASS_FILE_EXTENSION or  DEFAULT_NEW_PARTITION_NAME. They seem to have global plugin-wise meaning, but are used only inside the ui package, so at the moment I opt to leave them there.