Categories show their full path, and a pick always keeps its parents

In the products table, the Categories column now shows the full path of each category, like "Apparel > Shirts > T-Shirts", one path per category of the product. In the product editor, ticking a category selects its parents as well, and un-ticking one clears everything below it, so a product can never sit in a subcategory without its parent. The category filter, the counts and the categories each channel receives now treat a product in a subcategory as being in every parent too. More in Categories.