[NUI] Fix issue that default value of BindableProperty is incorrect. (#3024)

diff --git a/src/Tizen.NUI/src/internal/WebView/WebView.cs b/src/Tizen.NUI/src/internal/WebView/WebView.cs
index 7f1175d..38f549b 100755 (executable)
--- a/src/Tizen.NUI/src/internal/WebView/WebView.cs
+++ b/src/Tizen.NUI/src/internal/WebView/WebView.cs
@@ -1323,7 +1323,7 @@ namespace Tizen.NUI
             return temp;
         });
 
-        private static readonly BindableProperty TitleProperty = BindableProperty.Create(nameof(Title), typeof(string), typeof(WebView), null, defaultValueCreator: (bindable) =>
+        private static readonly BindableProperty TitleProperty = BindableProperty.Create(nameof(Title), typeof(string), typeof(WebView), string.Empty, defaultValueCreator: (bindable) =>
         {
             var webview = (WebView)bindable;
             string title;
@@ -1379,7 +1379,7 @@ namespace Tizen.NUI
             return temp;
         });
 
-        private static readonly BindableProperty ContentBackgroundColorProperty = BindableProperty.Create(nameof(ContentBackgroundColor), typeof(Vector4), typeof(WebView), true, propertyChanged: (bindable, oldValue, newValue) =>
+        private static readonly BindableProperty ContentBackgroundColorProperty = BindableProperty.Create(nameof(ContentBackgroundColor), typeof(Vector4), typeof(WebView), null, propertyChanged: (bindable, oldValue, newValue) =>
         {
             var webview = (WebView)bindable;
             if (newValue != null)
@@ -1409,7 +1409,7 @@ namespace Tizen.NUI
             return webview.tilesClearedWhenHidden;
         });
 
-        private static readonly BindableProperty TileCoverAreaMultiplierProperty = BindableProperty.Create(nameof(TileCoverAreaMultiplier), typeof(float), typeof(WebView), true, propertyChanged: (bindable, oldValue, newValue) =>
+        private static readonly BindableProperty TileCoverAreaMultiplierProperty = BindableProperty.Create(nameof(TileCoverAreaMultiplier), typeof(float), typeof(WebView), 0.0f, propertyChanged: (bindable, oldValue, newValue) =>
         {
             var webview = (WebView)bindable;
             if (newValue != null)
@@ -1439,7 +1439,7 @@ namespace Tizen.NUI
             return webview.cursorEnabledByClient;
         });
 
-        private static readonly BindableProperty SelectedTextProperty = BindableProperty.Create(nameof(SelectedText), typeof(string), typeof(WebView), null, defaultValueCreator: (bindable) =>
+        private static readonly BindableProperty SelectedTextProperty = BindableProperty.Create(nameof(SelectedText), typeof(string), typeof(WebView), string.Empty, defaultValueCreator: (bindable) =>
         {
             var webview = (WebView)bindable;
             string text;
@@ -1447,7 +1447,7 @@ namespace Tizen.NUI
             return text;
         });
 
-        private static readonly BindableProperty PageZoomFactorProperty = BindableProperty.Create(nameof(PageZoomFactor), typeof(float), typeof(WebView), true, propertyChanged: (bindable, oldValue, newValue) =>
+        private static readonly BindableProperty PageZoomFactorProperty = BindableProperty.Create(nameof(PageZoomFactor), typeof(float), typeof(WebView), 0.0f, propertyChanged: (bindable, oldValue, newValue) =>
         {
             var webview = (WebView)bindable;
             if (newValue != null)
@@ -1463,7 +1463,7 @@ namespace Tizen.NUI
             return temp;
         });
 
-        private static readonly BindableProperty TextZoomFactorProperty = BindableProperty.Create(nameof(TextZoomFactor), typeof(float), typeof(WebView), true, propertyChanged: (bindable, oldValue, newValue) =>
+        private static readonly BindableProperty TextZoomFactorProperty = BindableProperty.Create(nameof(TextZoomFactor), typeof(float), typeof(WebView), 0.0f, propertyChanged: (bindable, oldValue, newValue) =>
         {
             var webview = (WebView)bindable;
             if (newValue != null)
@@ -1479,7 +1479,7 @@ namespace Tizen.NUI
             return temp;
         });
 
-        private static readonly BindableProperty LoadProgressPercentageProperty = BindableProperty.Create(nameof(LoadProgressPercentage), typeof(float), typeof(WebView), null, defaultValueCreator: (bindable) =>
+        private static readonly BindableProperty LoadProgressPercentageProperty = BindableProperty.Create(nameof(LoadProgressPercentage), typeof(float), typeof(WebView), 0.0f, defaultValueCreator: (bindable) =>
         {
             var webview = (WebView)bindable;
             float percentage;