FilterModel: Fix invisible vertical header

Author: timschneeb

src/VdcEditorWindow.ui

@@ -76,6 +76,9 @@
           <property name="sortingEnabled">
            <bool>true</bool>
           </property>
+          <attribute name="verticalHeaderVisible">
+           <bool>true</bool>
+          </attribute>
          </widget>
         </item>
        </layout>
@@ -120,7 +123,7 @@
      <x>0</x>
      <y>0</y>
      <width>976</width>
-     <height>20</height>
+     <height>18</height>
     </rect>
    </property>
    <property name="nativeMenuBar">

src/model/FilterModel.cpp

@@ -143,6 +143,13 @@ QVariant FilterModel::data(const QModelIndex &index, int role) const
 }
 
 QVariant FilterModel::headerData(int section, Qt::Orientation orientation, int role) const {
+    if (role == Qt::DisplayRole) {
+        if (orientation == Qt::Vertical) {
+            // Render row number in vertical header rows
+            return section;
+        }
+    }
+
     if (orientation != Qt::Horizontal || role != Qt::DisplayRole) return {};
     switch (section) {
     case Type: return "Type";