[Gallery] Text field demo fixes (#302)

* Misc text field demo fixes

* Update code_segments.dart

gallery/gallery/lib/codeviewer/code_segments.dart

@@ -27879,7 +27879,7 @@ class CodeSegments {
           text: '\u000a                    prefixText'),
       TextSpan(style: codeStyle.punctuationStyle, text: ':'),
       TextSpan(style: codeStyle.baseStyle, text: ' '),
-      TextSpan(style: codeStyle.stringStyle, text: '\u0027+1\u0027'),
+      TextSpan(style: codeStyle.stringStyle, text: '\u0027+1 \u0027'),
       TextSpan(style: codeStyle.punctuationStyle, text: ','),
       TextSpan(style: codeStyle.baseStyle, text: '\u000a                  '),
       TextSpan(style: codeStyle.punctuationStyle, text: '),'),
@@ -27910,6 +27910,20 @@ class CodeSegments {
       TextSpan(style: codeStyle.punctuationStyle, text: ';'),
       TextSpan(style: codeStyle.baseStyle, text: '\u000a                  '),
       TextSpan(style: codeStyle.punctuationStyle, text: '},'),
+      TextSpan(
+          style: codeStyle.baseStyle,
+          text: '\u000a                  maxLength'),
+      TextSpan(style: codeStyle.punctuationStyle, text: ':'),
+      TextSpan(style: codeStyle.baseStyle, text: ' '),
+      TextSpan(style: codeStyle.numberStyle, text: '14'),
+      TextSpan(style: codeStyle.punctuationStyle, text: ','),
+      TextSpan(
+          style: codeStyle.baseStyle,
+          text: '\u000a                  maxLengthEnforced'),
+      TextSpan(style: codeStyle.punctuationStyle, text: ':'),
+      TextSpan(style: codeStyle.baseStyle, text: ' '),
+      TextSpan(style: codeStyle.keywordStyle, text: 'false'),
+      TextSpan(style: codeStyle.punctuationStyle, text: ','),
       TextSpan(
           style: codeStyle.baseStyle,
           text: '\u000a                  validator'),
@@ -28189,20 +28203,6 @@ class CodeSegments {
       TextSpan(style: codeStyle.punctuationStyle, text: ').'),
       TextSpan(style: codeStyle.baseStyle, text: 'demoTextFieldUSD'),
       TextSpan(style: codeStyle.punctuationStyle, text: ','),
-      TextSpan(
-          style: codeStyle.baseStyle,
-          text: '\u000a                    suffixStyle'),
-      TextSpan(style: codeStyle.punctuationStyle, text: ':'),
-      TextSpan(style: codeStyle.baseStyle, text: ' '),
-      TextSpan(style: codeStyle.classStyle, text: 'TextStyle'),
-      TextSpan(style: codeStyle.punctuationStyle, text: '('),
-      TextSpan(style: codeStyle.baseStyle, text: 'color'),
-      TextSpan(style: codeStyle.punctuationStyle, text: ':'),
-      TextSpan(style: codeStyle.baseStyle, text: ' '),
-      TextSpan(style: codeStyle.classStyle, text: 'Colors'),
-      TextSpan(style: codeStyle.punctuationStyle, text: '.'),
-      TextSpan(style: codeStyle.baseStyle, text: 'green'),
-      TextSpan(style: codeStyle.punctuationStyle, text: '),'),
       TextSpan(style: codeStyle.baseStyle, text: '\u000a                  '),
       TextSpan(style: codeStyle.punctuationStyle, text: '),'),
       TextSpan(

gallery/gallery/lib/demos/material/text_field_demo.dart

@@ -209,12 +209,14 @@ class TextFormFieldDemoState extends State<TextFormFieldDemo> {
                         .demoTextFieldWhereCanWeReachYou,
                     labelText: GalleryLocalizations.of(context)
                         .demoTextFieldPhoneNumber,
-                    prefixText: '+1',
+                    prefixText: '+1 ',
                   ),
                   keyboardType: TextInputType.phone,
                   onSaved: (value) {
                     person.phoneNumber = value;
                   },
+                  maxLength: 14,
+                  maxLengthEnforced: false,
                   validator: _validatePhoneNumber,
                   // TextInputFormatters are applied in sequence.
                   inputFormatters: <TextInputFormatter>[
@@ -263,7 +265,6 @@ class TextFormFieldDemoState extends State<TextFormFieldDemo> {
                         GalleryLocalizations.of(context).demoTextFieldSalary,
                     suffixText:
                         GalleryLocalizations.of(context).demoTextFieldUSD,
-                    suffixStyle: TextStyle(color: Colors.green),
                   ),
                   maxLines: 1,
                 ),