Fix H/V content size calculate error

Author: iwecon

Demo/Demo/Base.lproj/Main.storyboard

@@ -74,7 +74,7 @@
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="NVa-Eg-Ijb" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="3648" y="-550"/>
+            <point key="canvasLocation" x="1849" y="-581"/>
         </scene>
         <!--H/VStackView-->
         <scene sceneID="Lai-fH-3ho">

Sources/StackKit/HStackView.swift

@@ -62,14 +62,11 @@ open class HStackView: UIView, StackView {
     }
 
     public var contentSize: CGSize {
-        let rect = effectiveSubviews.map({ $0.frame }).reduce(CGRect.zero) { result, rect in
-            result.union(rect)
-        }
+        let width = effectiveSubviews.map({ $0.frame }).reduce(CGRect.zero, { $0.union($1) }).width
+        let height = effectiveSubviews.map({ $0.bounds.height }).max() ?? 0
+        
         let offsetXLength = effectiveSubviews.map({ $0.frame.minX }).filter({ $0 < 0 }).min() ?? 0
-        return CGSize(
-            width: rect.width + paddingRight + offsetXLength,
-            height: rect.height + paddingVertically
-        )
+        return CGSize(width: width + paddingRight + offsetXLength, height: height + paddingVertically)
     }
 
     open func hideIfNoEffectiveViews() {

Sources/StackKit/VStackView.swift

@@ -62,14 +62,11 @@ open class VStackView: UIView, StackView {
     }
 
     public var contentSize: CGSize {
-        let rect = effectiveSubviews.map({ $0.frame }).reduce(CGRect.zero) { partialResult, rect in
-            partialResult.union(rect)
-        }
-        let offsetYLength: CGFloat = effectiveSubviews.map({ $0.frame.origin.y }).filter({ $0 < 0 }).min() ?? 0
-        return CGSize(
-            width: rect.width + paddingHorizontally,
-            height: rect.height + paddingBottom + offsetYLength
-        )
+        let width = effectiveSubviews.map({ $0.bounds.width }).max() ?? 0
+        let height = effectiveSubviews.map({ $0.frame }).reduce(CGRect.zero, { $0.union($1) }).height
+        
+        let offsetYLength: CGFloat = effectiveSubviews.map({ $0.frame.minY }).filter({ $0 < 0 }).min() ?? 0
+        return CGSize(width: width + paddingHorizontally, height: height + paddingBottom + offsetYLength)
     }
 
     open func hideIfNoEffectiveViews() {