NSSplitView: animation for collapsing pane should be wipe, not fade

Originator:kenferry
Number:rdar://19087180 Date Originated:
Status:Open Resolved:
Product: Product Version:
Classification: Reproducible:
 
If you animate a splitview pane closed with implicit animations, you get a fade out effect on the collapsing pane.

That looks weird a lot of the time. It oughta just be a wipe, where the splitter covers the view progressively.

See attached test project. This also affects GitHub for Mac's production app, https://github.com/mdiep/NSSplitViewTest/pull/1

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