NavigationController: Fixes resizing animation

Simplenote/SPNavigationController.swift

@@ -85,8 +85,12 @@ class SPNavigationController: NSViewController {
         let currentView = topViewController?.view
 
         attach(child: viewController)
-        if let currentView {
-            currentView.removeConstraints(currentView.constraints)
+
+        /// Disable Bottom Constraint
+        /// This allows for the enclosing NSWindow to resize, just enough to fit the `nextViewController.view`
+        ///
+        if let currentView, let bottomConstraint = view.firstContraint(firstView: currentView, firstAttribute: .bottom) {
+            bottomConstraint.isActive = false
         }
 
         guard let (leadingAnchor, trailingAnchor) = attachView(subview: viewController.view, below: currentView) else {
@@ -139,6 +143,13 @@ class SPNavigationController: NSViewController {
         guard viewStack.count > 1, let currentViewController = viewStack.popLast(), let nextViewController = viewStack.last else {
             return
         }
+
+        /// Disable Bottom Constraint
+        /// This allows for the enclosing NSWindow to resize, just enough to fit the `nextViewController.view`
+        ///
+        if let currentBottomConstraint = view.firstContraint(firstView: currentViewController.view, firstAttribute: .bottom) {
+            currentBottomConstraint.isActive = false
+        }
 
         attachView(subview: nextViewController.view, below: currentViewController.view)