[NUI] Add SpaceEvenly to FlexJustification

SpaceAround distributes the equal space to before, and after each item.
Therefore, the space between adjacent items is twice bigger than the
space between the beginning edge and the first item.

To distribute the equal space to before, between, and after each item,
SpaceEvenly is added to FlexJustification.

Requires:
https://review.tizen.org/gerrit/259252/

diff --git a/src/Tizen.NUI/src/public/Layouting/FlexLayout.cs b/src/Tizen.NUI/src/public/Layouting/FlexLayout.cs
index be9e542..3070fb4 100755 (executable)
--- a/src/Tizen.NUI/src/public/Layouting/FlexLayout.cs
+++ b/src/Tizen.NUI/src/public/Layouting/FlexLayout.cs
@@ -451,7 +451,7 @@ namespace Tizen.NUI
             get => (FlexJustification)Interop.FlexLayout.GetFlexJustification(swigCPtr);
             set
             {
-                if (value < FlexJustification.FlexStart || value > FlexJustification.SpaceAround)
+                if (value < FlexJustification.FlexStart || value > FlexJustification.SpaceEvenly)
                     throw new InvalidEnumArgumentException(nameof(Justification));
 
                 Interop.FlexLayout.SetFlexJustification(swigCPtr, (int)value);
@@ -570,11 +570,15 @@ namespace Tizen.NUI
             /// </summary>
             SpaceBetween,
             /// <summary>
+            /// Items are positioned with equal space before, and after the lines.<br/>
+            /// </summary>
+            SpaceAround,
+            /// <summary>
             /// Items are positioned with equal space before, between, and after the lines.<br/>
-            /// Compared to <see cref="FlexJustification.SpaceBetween"/> using <see cref="FlexJustification.SpaceAround"/>
-            /// will result in space being distributed to the beginning of the first child and end of the last child.
+            /// Spaces are distributed equally to the beginning of the first child, between each child, and the end of the last child.
             /// </summary>
-            SpaceAround
+            /// <since_tizen> 9 </since_tizen>
+            SpaceEvenly
         }
 
         /// <summary>