revert some changes

com.unity.uiwidgets/Runtime/widgets/editable_text.cs

             ToolbarOptions toolbarOptions = null,
             bool unityTouchKeyboard = false
         ) : base(key) {
-            toolbarOptions ??= new ToolbarOptions(
+            toolbarOptions = toolbarOptions ?? new ToolbarOptions(
                 copy: true,
                 cut: true,
                 paste: true,
             D.assert(dragStartBehavior != null);
             D.assert(toolbarOptions != null);
             _strutStyle = strutStyle;
-            inputFormatters ??= new List<TextInputFormatter>();
-            keyboardType ??= (maxLines == 1 ? TextInputType.text : TextInputType.multiline);
+            inputFormatters = inputFormatters ?? new List<TextInputFormatter>();
+            keyboardType = keyboardType ?? (maxLines == 1 ? TextInputType.text : TextInputType.multiline);
             List<TextInputFormatter> formatters = new List<TextInputFormatter>();
             if (inputFormatters == null) {
                 formatters = inputFormatters;

com.unity.uiwidgets/Runtime/widgets/fade_in_image.cs

         ) {
             D.assert(placeholder != null);
             D.assert(image != null);
-            fadeOutDuration ??= new TimeSpan(0, 0, 0, 0, 300);
-            fadeOutCurve ??= Curves.easeOut;
-            fadeInDuration ??= new TimeSpan(0, 0, 0, 0, 700);
+            fadeOutDuration = fadeOutDuration ?? new TimeSpan(0, 0, 0, 0, 300);
+            fadeOutCurve = fadeOutCurve ?? Curves.easeOut;
+            fadeInDuration = fadeInDuration ?? new TimeSpan(0, 0, 0, 0, 700);
-            alignment ??= Alignment.center;
+            alignment = alignment ?? Alignment.center;
             var imageProvider = placeholderScale != null
                 ? new ExactAssetImage(placeholder, bundle: bundle, scale: placeholderScale ?? 1.0f)
                 : (ImageProvider) new AssetImage(placeholder, bundle: bundle);

com.unity.uiwidgets/Runtime/widgets/framework.cs

                     badAncestors.Insert(0, result);
                     try {
                         List<ErrorDescription> errors = new List<ErrorDescription>();
-                        foreach (ParentDataElement<ParentData> ancestor in badAncestors)
+                        foreach (ParentDataElement<ParentData> parentDataElement in badAncestors)
-                                $"- {ancestor.widget} (typically placed directly inside a {ancestor.widget.debugTypicalAncestorWidgetClass} widget)"));
+                                $"- {parentDataElement.widget} (typically placed directly inside a {parentDataElement.widget.debugTypicalAncestorWidgetClass} widget)"));
                         List<DiagnosticsNode> results = new List<DiagnosticsNode>();
                         results.Add( new ErrorSummary("Incorrect use of ParentDataWidget."));
                         results.Add(new ErrorDescription("The following ParentDataWidgets are providing parent data to the same RenderObject:"));