NSSplitViewItem Vibrancy Is Not Added with Every Initializer

After yesterday's wrap up of my fix for vibrant table views, I have discovered that NSSplitViewItem has 3 initializer variants since macOS 10.11:

The latter will not add vibrancy. Guess who, by accident, discovered his table view to be wrapped in a init(sidebarWithViewController:) call.

I'll leave the other post up as reference for deactivating vibrancy and dealing with NSTableView text drawing intricacies.

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