Use the add button for adding categories.

src/plugins/coreplugin/dialogs/externaltoolconfig.cpp

@@ -41,6 +41,7 @@
 #include <QtCore/QTextStream>
 #include <QtCore/QFile>
 #include <QtGui/QMessageBox>
+#include <QtGui/QMenu>
 
 using namespace Core;
 using namespace Core::Internal;
@@ -73,6 +74,12 @@ ExternalToolConfig::ExternalToolConfig(QWidget *parent) :
     connect(ui->addButton, SIGNAL(clicked()), this, SLOT(addTool()));
     connect(ui->removeButton, SIGNAL(clicked()), this, SLOT(removeTool()));
 
+    QMenu *menu = new QMenu(ui->addButton);
+    ui->addButton->setMenu(menu);
+    QAction *addCategory = new QAction(tr("Add Category"), this);
+    menu->addAction(addCategory);
+    connect(addCategory, SIGNAL(triggered()), this, SLOT(addCategory()));
+
     showInfoForItem(0);
     updateButtons(ui->toolTree->currentItem());
 }
@@ -143,7 +150,6 @@ void ExternalToolConfig::handleCurrentItemChanged(QTreeWidgetItem *now, QTreeWid
 void ExternalToolConfig::updateButtons(QTreeWidgetItem *item)
 {
     ExternalTool *tool = 0;
-    ui->addButton->setEnabled(item != 0);
     if (item)
         tool = item->data(0, Qt::UserRole).value<ExternalTool *>();
     if (!tool) {
@@ -313,7 +319,10 @@ void ExternalToolConfig::addTool()
 {
     // find category to use
     QTreeWidgetItem *currentItem = ui->toolTree->currentItem();
-    QTC_ASSERT(currentItem, return);
+    if (!currentItem) {
+        addCategory();
+        return;
+    }
     QString category;
     QTreeWidgetItem *parent;
     if (currentItem->parent()) {
@@ -361,3 +370,24 @@ void ExternalToolConfig::removeTool()
     delete currentItem;
     delete tool;
 }
+
+void ExternalToolConfig::addCategory()
+{
+    const QString &categoryBase = tr("New category");
+    QString category = categoryBase;
+    int count = 0;
+    while (m_tools.contains(category)) {
+        ++count;
+        category = categoryBase + QString::number(count);
+    }
+    bool blocked = ui->toolTree->blockSignals(true); // block itemChanged
+    QTreeWidgetItem *item = new QTreeWidgetItem(QStringList() << category);
+    item->setFlags(TOOL_ITEM_FLAGS);
+    item->setData(0, Qt::UserRole, category); // save name for the renaming stuff
+    m_tools.insert(category, QList<ExternalTool *>());
+    int newIndex = m_tools.keys().indexOf(category);
+    ui->toolTree->insertTopLevelItem(newIndex, item);
+    ui->toolTree->blockSignals(blocked); // unblock itemChanged
+    ui->toolTree->setCurrentItem(item);
+    ui->toolTree->editItem(item);
+}

src/plugins/coreplugin/dialogs/externaltoolconfig.h

@@ -70,6 +70,7 @@ private slots:
     void updateCurrentItem();
     void addTool();
     void removeTool();
+    void addCategory();
 
 private:
     Ui::ExternalToolConfig *ui;

src/plugins/coreplugin/dialogs/externaltoolconfig.ui

@@ -42,6 +42,9 @@ p, li { white-space: pre-wrap; }
          <property name="text">
           <string>+</string>
          </property>
+         <property name="popupMode">
+          <enum>QToolButton::MenuButtonPopup</enum>
+         </property>
         </widget>
        </item>
        <item>
@@ -122,11 +125,7 @@ p, li { white-space: pre-wrap; }
        </widget>
       </item>
       <item row="1" column="1">
-       <widget class="Utils::PathChooser" name="executable">
-        <property name="expectedKind">
-         <enum>Utils::PathChooser::Command</enum>
-        </property>
-       </widget>
+       <widget class="Utils::PathChooser" name="executable" native="true"/>
       </item>
       <item row="2" column="0">
        <widget class="QLabel" name="argumentsLabel">
@@ -146,11 +145,7 @@ p, li { white-space: pre-wrap; }
        </widget>
       </item>
       <item row="3" column="1">
-       <widget class="Utils::PathChooser" name="workingDirectory">
-        <property name="expectedKind">
-         <enum>Utils::PathChooser::Command</enum>
-        </property>
-       </widget>
+       <widget class="Utils::PathChooser" name="workingDirectory" native="true"/>
       </item>
       <item row="4" column="0">
        <widget class="QLabel" name="outputLabel">