fix: reset view position on category type change

1. Added Connections in AppListView.qml to reset list position when
category type changes
2. Modified CategorizedSortProxyModel.cpp to properly emit signals and
reset model
3. Now emits categoryTypeChanged after model reset and sorting completes
4. Ensures consistent view behavior when switching between different
category types

fix: 类别类型更改时重置视图位置

1. 在 AppListView.qml 中添加连接，当类别类型改变时重置列表位置
2. 修改 CategorizedSortProxyModel.cpp 以正确发出信号并重置模型
3. 现在在模型重置和排序完成后发出 categoryTypeChanged 信号
4. 确保在不同类别类型之间切换时视图行为一致

Pms: BUG-322771

Author: wjyrich

qml/windowed/AppListView.qml

@@ -361,6 +361,13 @@ FocusScope {
             }
         }
 
+        Connections {
+            target: CategorizedSortProxyModel
+            function onCategoryTypeChanged() {
+                listView.positionViewAtBeginning()
+            }
+        }
+        
         section.property: CategorizedSortProxyModel.sortRoleName // "transliterated" // "category"
         section.criteria: section.property === "transliterated" ? ViewSection.FirstCharacter : ViewSection.FullString
         section.delegate: sectionHeading

src/models/categorizedsortproxymodel.cpp

@@ -15,7 +15,8 @@ DCORE_USE_NAMESPACE
 void CategorizedSortProxyModel::setCategoryType(CategoryType categoryType)
 {
     CategoryType oldCategoryType = this->categoryType();
-
+    
+    beginResetModel();
     isFreeSort = (categoryType == FreeCategory);
     switch (categoryType) {
     case Alphabetary:
@@ -31,10 +32,12 @@ void CategorizedSortProxyModel::setCategoryType(CategoryType categoryType)
     if (oldCategoryType != categoryType) {
         QScopedPointer<DConfig> config(DConfig::create("org.deepin.dde.shell", "org.deepin.ds.launchpad"));
         config->setValue("categoryType", categoryType);
-        emit categoryTypeChanged();
     }
 
     sort(0);
+    endResetModel();
+
+    emit categoryTypeChanged();
 }
 
 CategorizedSortProxyModel::CategoryType CategorizedSortProxyModel::categoryType() const