fix sizing defect

MVMCoreUI/BaseControllers/ThreeLayerCollectionViewController.swift

@@ -20,6 +20,12 @@ import Foundation
     public var bottomViewOutsideOfScrollArea: Bool = false
     public var topViewOutsideOfScrollArea: Bool = false
     
+    open override func updateViewConstraints() {
+        // Update the spacing on constraint update
+        updateFlexibleSpace()
+        super.updateViewConstraints()
+    }
+    
     /// Updates the padding for flexible space (header or footer)
     private func updateFlexibleSpace() {
         guard let collectionView = collectionView else { return }