Add support for CodeEditor edit config indentWithTabs

Will allow us to switch on or off the indentWithTabs config which will
indent the lines in tabs.

Bug: Issue 6609
Change-Id: If0e75de66a20d028ba066ff207f1d24e4633be27

gerrit-gwtui/src/main/java/com/google/gerrit/client/editor/EditPreferencesBox.java

@@ -69,6 +69,7 @@ public class EditPreferencesBox extends Composite {
   @UiField ToggleButton lineNumbers;
   @UiField ToggleButton matchBrackets;
   @UiField ToggleButton lineWrapping;
+  @UiField ToggleButton indentWithTabs;
   @UiField ToggleButton autoCloseBrackets;
   @UiField ToggleButton showBase;
   @UiField ListBox theme;
@@ -106,6 +107,7 @@ public class EditPreferencesBox extends Composite {
     lineNumbers.setValue(prefs.hideLineNumbers());
     matchBrackets.setValue(prefs.matchBrackets());
     lineWrapping.setValue(prefs.lineWrapping());
+    indentWithTabs.setValue(prefs.indentWithTabs());
     autoCloseBrackets.setValue(prefs.autoCloseBrackets());
     showBase.setValue(prefs.showBase());
     setTheme(prefs.theme());
@@ -215,6 +217,15 @@ public class EditPreferencesBox extends Composite {
     }
   }
 
+  @UiHandler("indentWithTabs")
+  void onIndentWithTabs(ValueChangeEvent<Boolean> e) {
+    prefs.indentWithTabs(e.getValue());
+    if (view != null) {
+      view.getEditor().setOption("indentWithTabs", prefs.indentWithTabs());
+    }
+  }
+
+
   @UiHandler("autoCloseBrackets")
   void onCloseBrackets(ValueChangeEvent<Boolean> e) {
     prefs.autoCloseBrackets(e.getValue());

gerrit-gwtui/src/main/java/com/google/gerrit/client/editor/EditPreferencesBox.ui.xml

@@ -245,6 +245,13 @@ limitations under the License.
           <g:downFace><ui:msg>On</ui:msg></g:downFace>
         </g:ToggleButton></td>
       </tr>
+      <tr>
+        <th><ui:msg>Indent With Tabs</ui:msg></th>
+        <td><g:ToggleButton ui:field='indentWithTabs'>
+          <g:upFace><ui:msg>Off</ui:msg></g:upFace>
+          <g:downFace><ui:msg>On</ui:msg></g:downFace>
+        </g:ToggleButton></td>
+      </tr>
       <tr>
         <th><ui:msg>Auto Close Brackets</ui:msg></th>
         <td><g:ToggleButton ui:field='autoCloseBrackets'>

gerrit-gwtui/src/main/java/com/google/gerrit/client/editor/EditScreen.java

@@ -581,6 +581,7 @@ public class EditScreen extends Screen {
             .set("keyMap", prefs.keyMapType().name().toLowerCase())
             .set("lineNumbers", prefs.hideLineNumbers())
             .set("lineWrapping", prefs.lineWrapping())
+            .set("indentWithTabs", prefs.indentWithTabs())
             .set("matchBrackets", prefs.matchBrackets())
             .set("mode", mode != null ? mode.mime() : null)
             .set("origLeft", editContent)