So:

1. I have a NSView V within a view hierarchy.
2. V holds a layout constraint C that offsets a subview S from the bottom edge 
of V.
3. At runtime I mutate -constant on constraint C.

The question is should the view hierarchy automatically recalculate its layout 
in response to changing the constant on C?

In practice I find that I have to call -layoutSubtreeIfNeeded on a superview of 
V.
I do not have to call -setNeedsLayout:YES

Note:

My actual implementation is more complex than the above.
V exists with an NSStackView subclass, so there are a lot of constraints at 
play.
However, if I can clarify the above it will help my thinking.


Jonathan












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