Debugger: Move watcher modification from delegate to model

We don't need the remove/re-insert cycle in the new model,
so the expression modification can be done directly.

Change-Id: If9626f48fcfbcf75e61d332afb59b986da6c2dbc
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/watchhandler.cpp

@@ -857,8 +857,25 @@ bool WatchModel::setData(const QModelIndex &idx, const QVariant &value, int role
     switch (role) {
         case Qt::EditRole:
             switch (idx.column()) {
-            case 0: // Watch expression: See delegate.
+            case 0: {
+                QByteArray exp = value.toByteArray();
+                if (!exp.isEmpty()) {
+                    theWatcherNames.remove(item->d.exp);
+                    item->d.exp = exp;
+                    item->d.name = QString::fromLatin1(exp);
+                    theWatcherNames[exp] = m_handler->m_watcherCounter++;
+                    m_handler->saveWatchers();
+                    if (engine()->state() == DebuggerNotReady) {
+                        item->d.setAllUnneeded();
+                        item->d.setValue(QString(QLatin1Char(' ')));
+                        item->d.setHasChildren(false);
+                    } else {
+                        engine()->updateWatchData(item->d);
+                    }
+                }
+                m_handler->updateWatchersWindow();
                 break;
+            }
             case 1: // Change value
                 engine()->assignValueInDebugger(&data, item->expression(), value);
                 break;

src/plugins/debugger/watchwindow.cpp

@@ -116,27 +116,6 @@ public:
         return lineEdit;
     }
 
-    void setModelData(QWidget *editor, QAbstractItemModel *model,
-                      const QModelIndex &index) const
-    {
-        // Standard handling for anything but the watcher name column (change
-        // expression), which removes/recreates a row, which cannot be done
-        // in model->setData().
-        if (index.column() != 0) {
-            QItemDelegate::setModelData(editor, model, index);
-            return;
-        }
-        const QMetaProperty userProperty = editor->metaObject()->userProperty();
-        QTC_ASSERT(userProperty.isValid(), return);
-        const QString value = editor->property(userProperty.name()).toString();
-        const QString exp = index.data(LocalsExpressionRole).toString();
-        if (exp == value)
-            return;
-        WatchHandler *handler = currentEngine()->watchHandler();
-        handler->removeData(index.data(LocalsINameRole).toByteArray());
-        handler->watchExpression(value);
-    }
-
     void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option,
         const QModelIndex &) const
     {