minor fixes

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

         }
 
         void _updateFocusHighlights() {
-            bool showFocus;
+            bool showFocus = false;
             switch (FocusManager.instance.highlightMode) {
                 case FocusHighlightMode.touch: {
                     showFocus = false;

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

             textSelectionControls = _MaterialTextSelectionControls.materialTextSelectionControls;
             paintCursorAboveText = false;
             cursorOpacityAnimates = false;
-            cursorColor ??= themeData.cursorColor;
+            cursorColor = cursorColor ?? themeData.cursorColor;
 
             Widget child = new RepaintBoundary(
                 child: new EditableText(
                     onExit: onExit,
                     child: new AnimatedBuilder(
                         animation: controller,
-                        builder: (BuildContext context, Widget child) => { return child; },
+                        builder: (BuildContext buildContext, Widget buildChild) => { return buildChild; },
                         child: _selectionGestureDetectorBuilder.buildGestureDetector(
                             behavior: HitTestBehavior.translucent,
                             child: child