InlineEdit: make autoindent width (indentUnit) configurable

Allow to configure the indent unit for inline edit mode.
Currently it is not possible to configure it per file-type
(e.g java:2, python:4),
but one can adjust it via the edit preferences.

Change-Id: Ie5167c615f963212f53ec3c87c687dba0f043010

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

@@ -60,6 +60,7 @@ public class EditPreferencesBox extends Composite {
   @UiField Anchor close;
   @UiField NpIntTextBox tabWidth;
   @UiField NpIntTextBox lineLength;
+  @UiField NpIntTextBox indentUnit;
   @UiField NpIntTextBox cursorBlinkRate;
   @UiField ToggleButton topMenu;
   @UiField ToggleButton syntaxHighlighting;
@@ -94,6 +95,7 @@ public class EditPreferencesBox extends Composite {
 
     tabWidth.setIntValue(prefs.tabSize());
     lineLength.setIntValue(prefs.lineLength());
+    indentUnit.setIntValue(prefs.indentUnit());
     cursorBlinkRate.setIntValue(prefs.cursorBlinkRate());
     topMenu.setValue(!prefs.hideTopMenu());
     syntaxHighlighting.setValue(prefs.syntaxHighlighting());
@@ -128,6 +130,17 @@ public class EditPreferencesBox extends Composite {
     }
   }
 
+  @UiHandler("indentUnit")
+  void onIndentUnit(ValueChangeEvent<String> e) {
+    String v = e.getValue();
+    if (v != null && v.length() > 0) {
+      prefs.indentUnit(Math.max(0, Integer.parseInt(v)));
+      if (view != null) {
+        view.setIndentUnit(prefs.indentUnit());
+      }
+    }
+  }
+
   @UiHandler("cursorBlinkRate")
   void onCursoBlinkRate(ValueChangeEvent<String> e) {
     String v = e.getValue();

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

@@ -183,6 +183,12 @@ limitations under the License.
             visibleLength='4'
             alignment='RIGHT'/></td>
       </tr>
+      <tr>
+        <th><ui:msg>Indent Unit</ui:msg></th>
+        <td><x:NpIntTextBox ui:field='indentUnit'
+            visibleLength='4'
+            alignment='RIGHT'/></td>
+      </tr>
       <tr>
         <th><ui:msg>Cursor Blink Rate</ui:msg></th>
         <td><x:NpIntTextBox ui:field='cursorBlinkRate'

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

@@ -366,6 +366,11 @@ public class EditScreen extends Screen {
         Patch.COMMIT_MSG.equals(path) ? 72 : length);
   }
 
+  void setIndentUnit(int indent) {
+    cm.setOption("indentUnit",
+        Patch.COMMIT_MSG.equals(path) ? 2 : indent);
+  }
+
   void setShowLineNumbers(boolean show) {
     cm.setOption("lineNumbers", show);
   }
@@ -424,6 +429,7 @@ public class EditScreen extends Screen {
         .set("autoCloseBrackets", prefs.autoCloseBrackets())
         .set("cursorBlinkRate", prefs.cursorBlinkRate())
         .set("cursorHeight", 0.85)
+        .set("indentUnit", prefs.indentUnit())
         .set("keyMap", prefs.keyMapType().name().toLowerCase())
         .set("lineNumbers", prefs.hideLineNumbers())
         .set("lineWrapping", false)