fix Equals calls on nullable objects

Author: zhuxingwei

com.unity.uiwidgets/Runtime/material/button_bar_theme.cs

@@ -99,8 +99,8 @@ public bool Equals(ButtonBarThemeData other) {
             }
 
             return alignment == other.alignment && mainAxisSize == other.mainAxisSize &&
-                   buttonTextTheme == other.buttonTextTheme && buttonMinWidth.Equals(other.buttonMinWidth) &&
-                   buttonHeight.Equals(other.buttonHeight) && Equals(buttonPadding, other.buttonPadding) &&
+                   buttonTextTheme == other.buttonTextTheme && Equals(buttonMinWidth, other.buttonMinWidth) &&
+                   Equals(buttonHeight, other.buttonHeight) && Equals(buttonPadding, other.buttonPadding) &&
                    buttonAlignedDropdown == other.buttonAlignedDropdown && layoutBehavior == other.layoutBehavior &&
                    overflowDirection == other.overflowDirection;
         }

com.unity.uiwidgets/Runtime/material/toggle_buttons_theme.cs

@@ -139,21 +139,21 @@ public bool Equals(ToggleButtonsThemeData other) {
                 return true;
             }
 
-            return  textStyle.Equals(other.textStyle)
-                    && constraints.Equals(other.constraints)
-                    && color.Equals(other.color)
-                    && selectedColor.Equals(other.selectedColor)
-                    && disabledColor.Equals(other.disabledColor)
-                    && fillColor.Equals(other.fillColor)
-                    && focusColor.Equals(other.focusColor)
-                    && highlightColor.Equals(other.highlightColor)
-                    && hoverColor.Equals(other.hoverColor)
-                    && splashColor.Equals(other.splashColor)
-                    && borderColor.Equals(other.borderColor)
-                    && selectedBorderColor.Equals(other.selectedBorderColor)
-                    && disabledBorderColor.Equals(other.disabledBorderColor)
-                    && borderRadius.Equals(other.borderRadius)
-                    && borderWidth.Equals(other.borderWidth);
+            return  Equals(textStyle, other.textStyle)
+                    && Equals(constraints, other.constraints)
+                    && Equals(color, other.color)
+                    && Equals(selectedColor, other.selectedColor)
+                    && Equals(disabledColor,other.disabledColor)
+                    && Equals(fillColor, other.fillColor)
+                    && Equals(focusColor, other.focusColor)
+                    && Equals(highlightColor, other.highlightColor)
+                    && Equals(hoverColor, other.hoverColor)
+                    && Equals(splashColor, other.splashColor)
+                    && Equals(borderColor, other.borderColor)
+                    && Equals(selectedBorderColor, other.selectedBorderColor)
+                    && Equals(disabledBorderColor, other.disabledBorderColor)
+                    && Equals(borderRadius, other.borderRadius)
+                    && Equals(borderWidth, other.borderWidth);
         }
 
 

com.unity.uiwidgets/Runtime/material/tooltip_theme.cs

@@ -116,16 +116,16 @@ public bool Equals(TooltipThemeData other)
                 return true;
             }
 
-            return height.Equals(other.height) 
-                   && padding.Equals(other.padding) 
-                   && margin.Equals(other.margin) 
-                   && verticalOffset.Equals(other.verticalOffset) 
+            return Equals(height, other.height) 
+                   && Equals(padding, other.padding) 
+                   && Equals(margin, other.margin) 
+                   && Equals(verticalOffset, other.verticalOffset) 
                    && preferBelow == other.preferBelow 
                    && excludeFromSemantics == other.excludeFromSemantics 
-                   && decoration.Equals(other.decoration) 
-                   && textStyle.Equals(other.textStyle) 
-                   && waitDuration.Equals(other.waitDuration) 
-                   && showDuration.Equals(other.showDuration);
+                   && Equals(decoration, other.decoration) 
+                   && Equals(textStyle, other.textStyle) 
+                   && Equals(waitDuration, other.waitDuration) 
+                   && Equals(showDuration, other.showDuration);
         }
         public override bool Equals(object obj)
         { 

com.unity.uiwidgets/Runtime/painting/border_radius.cs

@@ -427,10 +427,10 @@ public bool Equals(BorderRadius other) {
                 return true;
             }
 
-            return topLeft.Equals(other.topLeft)
-                   && topRight.Equals(other.topRight)
-                   && bottomRight.Equals(other.bottomRight)
-                   && bottomLeft.Equals(other.bottomLeft);
+            return Equals(topLeft, topLeft)
+                   && Equals(topRight, other.topRight)
+                   && Equals(bottomRight, other.bottomRight)
+                   && Equals(bottomLeft, other.bottomLeft);
         }
 
         public override bool Equals(object obj) {