grouped tableview fix

Author: psharanda

LayoutOps/LayoutOps/NodesDisplayAdapter.swift

@@ -5,13 +5,14 @@
 
 import Foundation
 
-public final class NodesSequenceDisplayAdapter<Index: Hashable> {
+final class NodesSequenceDisplayAdapter<Index: Hashable> {
 
     private let itemNode: (Index, Bool)-> RootNode
 
     private var cache = [Index: RootNode]()
 
-    public init(itemNode: @escaping (Index, Bool)-> RootNode) {
+    
+    init(itemNode: @escaping (Index, Bool)-> RootNode) {
         self.itemNode = itemNode
     }
 

LayoutOps/LayoutOps/UIKit/TableViewNodesDisplayAdapter.swift

@@ -39,7 +39,12 @@ public final class TableViewNodesDisplayAdapter {
     //MARK: - footers
 
     public func tableView(_ tableView: UITableView, estimatedHeightForFooterInSection section: Int) -> CGFloat {
-        return footerNodeSequence.estimatedSize(for: section, size: CGSize(width: tableView.bounds.size.width, height: 0)).height
+        let h = footerNodeSequence.estimatedSize(for: section, size: CGSize(width: tableView.bounds.size.width, height: 0)).height
+        if isAlmostEqual(left: h, right: 0) {
+            return 2
+        } else {
+            return h
+        }
     }
 
     public func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
@@ -59,7 +64,12 @@ public final class TableViewNodesDisplayAdapter {
     //MARK: - headers
 
     public func tableView(_ tableView: UITableView, estimatedHeightForHeaderInSection section: Int) -> CGFloat {
-        return headerNodeSequence.estimatedSize(for: section, size: CGSize(width: tableView.bounds.size.width, height: 0)).height
+        let h = headerNodeSequence.estimatedSize(for: section, size: CGSize(width: tableView.bounds.size.width, height: 0)).height
+        if isAlmostEqual(left: h, right: 0) {
+            return 2
+        } else {
+            return h
+        }
     }
 
     public func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {