Widen the Quick Settings panel to fit the tab labels

shell/plugins/panels/quick-settings/TabBar.qml

@@ -9,9 +9,21 @@ Row {
   property string currentTab: ""
   signal tabRequested(string tabId)
 
+  readonly property real widestTabWidth: {
+    var widest = 0
+    for (var index = 0; index < tabRepeater.count; index++) {
+      var tab = tabRepeater.itemAt(index)
+      if (tab) widest = Math.max(widest, tab.implicitWidth)
+    }
+    return widest
+  }
+  readonly property real requiredWidth: root.widestTabWidth * root.tabs.length
+    + root.spacing * Math.max(0, root.tabs.length - 1)
+
   spacing: Style.spaceReal(6)
 
   Repeater {
+    id: tabRepeater
     model: root.tabs
 
     Button {