feat: add focus with AlphabetCategory when change to another word.

as title.

PMS-BUG-289159

Author: wjyrich

qml/windowed/AlphabetCategoryPopup.qml

@@ -31,6 +31,15 @@ Popup {
     width: alphabetCategoryContainer.width + 20
     height: alphabetCategoryContainer.height + 20
 
+    function setCurrentCategory(category) {
+        for (let i = 0; i < alphabetCategoryDelegateModel.model.length; i++) {
+            if (alphabetCategoryDelegateModel.model[i] === category) {
+                alphabetCategoryContainer.currentIndex = i
+                break
+            }
+        }
+    }
+
     DelegateModel {
         id: alphabetCategoryDelegateModel
 
@@ -100,6 +109,18 @@ Popup {
        activeFocusOnTab: gridViewFocus
     }
 
+    Item {
+        focus: root.visible
+        Keys.onPressed: function (event) {
+            if (event.key === Qt.Key_Left ||
+                event.key === Qt.Key_Right ||
+                event.key === Qt.Key_Up ||
+                event.key === Qt.Key_Down) {
+                alphabetCategoryContainer.focus = true
+            }
+        }
+    }
+
     background: FloatingPanel {
         radius: DStyle.Style.popup.radius
         dropShadowColor: null

qml/windowed/AppListView.qml

@@ -129,6 +129,7 @@ FocusScope {
                         onClicked: {
                             if (CategorizedSortProxyModel.categoryType === CategorizedSortProxyModel.Alphabetary) {
                                 alphabetCategoryPopup.existingSections = CategorizedSortProxyModel.alphabetarySections()
+                                alphabetCategoryPopup.setCurrentCategory(section.toUpperCase())
                                 var mousePos = mapToItem(listView, mouseX, mouseY)
                                 var y = (mousePos.y + alphabetCategoryPopup.height) < listView.height ? mousePos.y : listView.height - alphabetCategoryPopup.height
                                 alphabetCategoryPopup.y = y

qml/windowed/GridViewContainer.qml

@@ -36,6 +36,7 @@ FocusScope {
     readonly property alias gridViewWidth: gridView.width
     property alias highlight: gridView.highlight
     property ScrollBar vScrollBar
+    property alias currentIndex: gridView.currentIndex
 
     function positionViewAtBeginning() {
         gridView.positionViewAtBeginning()