Deletes mark, so that it’s no longer located anywhere in the buffer. Removes the reference the buffer holds to the mark, so if you haven’t called g_object_ref() on the mark, it will be freed. Even if the mark isn’t freed, most operations on mark become invalid, until it gets added to a buffer again with TextBuffer.addMark. Use TextMark.getDeleted to find out if a mark has been removed from its buffer. The mark-deleted signal will be emitted as notification after the mark is deleted.