* When merging two adjacent changes, the changetime is not considered,
* only the equality of the change type and author is checked (in method
* isSimilarTo(...)). If two changes are in fact merged (in method merge()),
* When merging two adjacent changes, the changetime is not considered,
* only the equality of the change type and author is checked (in method
* isSimilarTo(...)). If two changes are in fact merged (in method merge()),