add attwm support

widgets/Bar.qml

@@ -35,7 +35,7 @@ PanelWindow {
     // depend on which row anything sits in, so this can't bind-loop.
     readonly property real neededWidth:
         (Theme.gap + 2) * 2                 // outer margins
-        + workspaces.implicitWidth
+        + leftRow.implicitWidth
         + Theme.gap * 4                     // breathing room between clusters
         + metricsRow.implicitWidth
         + Theme.gap
@@ -50,13 +50,23 @@ PanelWindow {
         color: Theme.barColor
     }
 
-    // row 1 left: workspaces
-    Workspaces {
-        id: workspaces
+    // row 1 left: workspaces, plus the layout symbol under attwm (hidden
+    // otherwise, and a hidden item takes no space in a RowLayout)
+    RowLayout {
+        id: leftRow
         anchors.left: parent.left
         anchors.leftMargin: Theme.gap + 2
         y: (Theme.barHeight - height) / 2
-        screen: panel.modelData
+        spacing: Theme.gap
+
+        Workspaces {
+            screen: panel.modelData
+            Layout.alignment: Qt.AlignVCenter
+        }
+        LayoutSymbol {
+            screen: panel.modelData
+            Layout.alignment: Qt.AlignVCenter
+        }
     }
 
     // row 1 right: clock, tray