development: fixed ordering with NavigationBar when backButton is present

Material.podspec

 Pod::Spec.new do |s|
   s.name = 'Material'
-  s.version = '2.3.12'
+  s.version = '2.3.13'
   s.license = 'BSD-3-Clause'
   s.summary = 'Material is an animation and graphics framework that is used to create beautiful applications.'
   s.homepage = 'http://materialswift.com'

Sources/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>2.3.12</string>
+	<string>2.3.13</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>

Sources/iOS/Grid.swift

@@ -39,7 +39,7 @@ public enum GridAxisDirection: Int {
 
 public struct GridAxis {
     /// The direction the grid lays its views out.
-    var direction = GridAxisDirection.horizontal
+    public var direction = GridAxisDirection.horizontal
     
     /// The rows size.
     public var rows: Int
@@ -77,12 +77,12 @@ public struct GridOffset {
 }
 
 public struct Grid {
-    /// Defer the calculation.
-    public var deferred = false
-    
     /// Context view.
     internal weak var context: UIView?
     
+    /// Defer the calculation.
+    public var deferred = false
+    
     /// Number of rows.
     public var rows: Int {
         didSet {
@@ -197,6 +197,13 @@ public struct Grid {
             return
         }
         
+        for v in views {
+            if canvas != v.superview {
+                v.removeFromSuperview()
+                canvas.addSubview(v)
+            }
+        }
+        
         guard 0 < canvas.width && 0 < canvas.height else {
             return
         }
@@ -211,11 +218,6 @@ public struct Grid {
         var i = 0
         
         for v in views {
-            if canvas != v.superview {
-                v.removeFromSuperview()
-                canvas.addSubview(v)
-            }
-            
             // Forces the view to adjust accordingly to size changes, ie: UILabel.
             (v as? UILabel)?.sizeToFit()
             

Sources/iOS/NavigationController.swift

@@ -141,7 +141,7 @@ extension NavigationController: UINavigationBarDelegate {
         if let v = navigationBar as? NavigationBar {
             item.backButton.addTarget(self, action: #selector(handleBackButton), for: .touchUpInside)
             item.backButton.image = v.backButtonImage
-            item.leftViews.append(item.backButton)
+            item.leftViews.insert(item.backButton, at: 0)
             v.layoutNavigationItem(item: item)
         }
         return true