ensure a tab is selected

declarativeimports/plasmacomponents/qml/TabBar.qml

@@ -90,6 +90,7 @@ FocusScope {
     PlasmaCore.FrameSvgItem {
         id: buttonFrame
 
+        visible: currentTab !== null
         x: currentTab.x + backgroundFrame.margins.left
         y: backgroundFrame.margins.top
         width: currentTab.width + buttonFrame.margins.left + buttonFrame.margins.right
@@ -113,10 +114,5 @@ FocusScope {
             rightMargin: backgroundFrame.margins.right + buttonFrame.margins.right
             bottomMargin: backgroundFrame.margins.bottom + buttonFrame.margins.bottom
         }
-        Component.onCompleted: {
-            if (!root.currentTab) {
-                root.currentTab = tabBarLayout.children[0]
-            }
-        }
     }
 }

declarativeimports/plasmacomponents/qml/private/TabBarLayout.qml

@@ -146,6 +146,16 @@ Item {
             }
             root.implicitWidth = contentWidth
             root.implicitHeight = contentHeight
+            if (root.parent.currentTab === null) {
+                //99% of the cases this loop will be length 1 but a tabbar can also have other children, such as Repeater
+                for (var i = 0; i < tabBarLayout.children.length; ++i) {
+                    //anything with a checked property may act as tabbutton
+                    if (tabBarLayout.children[i].checked !== undefined) {
+                        root.parent.currentTab = tabBarLayout.children[i]
+                        break;
+                    }
+                }
+            }
         }
     }
 }