It's impossible to name all the places that undo does not undo the proper action. For example, if one hits undo in Change Parameters, parameter changes are not undone but whatever action was last done outside the current context (not the last action) was undone.
This is not how undo is supposed to work! Whatever change was last made (changing a text box, modifying a parameter, etc.) should be what undo undoes. There is no circumstance where it is acceptable that undo in the current context changes contexts and undoes something else. THIS IS BROKEN BEHAVIOR.
Having Mac OS provide all of the proper undo features is super easy so long as developers aren't super lazy. There is no excuse for not implementing this properly.
