Improve tab focus of the application lists

discover/qml/ApplicationsListPage.qml

@@ -104,6 +104,11 @@ DiscoverPage {
 
     Kirigami.CardsListView {
         id: apps
+        activeFocusOnTab: true
+        currentIndex: -1
+        onActiveFocusChanged: if (activeFocus && currentIndex === -1) {
+            currentIndex = 0;
+        }
 
         section.delegate: Label {
             text: section
@@ -121,7 +126,6 @@ DiscoverPage {
                 apps.currentIndex = -1
             }
         }
-        currentIndex: -1
         delegate: ApplicationDelegate {
             application: model.application
             compact: !applicationWindow().wideScreen

discover/qml/BrowsingPage.qml

@@ -94,7 +94,11 @@ DiscoverPage
     Kirigami.CardsListView {
         id: apps
         model: FeaturedModel {}
+        activeFocusOnTab: true
         Component.onCompleted: apps.bottomMargin = Kirigami.Units.largeSpacing * 2
+        onActiveFocusChanged: if (activeFocus && currentIndex === -1) {
+            currentIndex = 0;
+        }
         currentIndex: -1
         delegate: ApplicationDelegate {
             application: model.application

discover/qml/InstallApplicationButton.qml

@@ -84,8 +84,7 @@ ConditionalLoader
         enabled: application.state !== AbstractResource.Broken
         text: compact ? "" : root.text
         icon.name: compact ? root.action.icon.name : ""
-        focus: true
-
+        activeFocusOnTab: false
         onClicked: root.click()
     }
 }