其他-修复：从首页选择一个带权限的文档进入合并功能，点击合并按钮没有反应的问题

PDF Office/CustomControl/AlertsMessage.xaml.cs

@@ -226,12 +226,18 @@ namespace PDF_Master.CustomControl
 
         private void ChbDonotAskAgain_Checked(object sender, RoutedEventArgs e)
         {
-            isChecked = true;
+            if (IsLoaded)
+            {
+                isChecked = true;
+            }
         }
 
         private void ChbDonotAskAgain_Unchecked(object sender, RoutedEventArgs e)
         {
-            isChecked = false;
+            if (IsLoaded)
+            {
+                isChecked = false;
+            }
         }
     }
 }

PDF Office/ViewModels/Dialog/ToolsDialogs/MergeDialogViewModel.cs

@@ -516,6 +516,12 @@ namespace PDF_Master.ViewModels.Dialog.ToolsDialogs
                             doc.Release();
                             continue;
                         }
+                        //添加的第一个文档有权限密码时，保存密码，避免合并时因没有密码导致合并失败
+                        //表现为在首页打开一个带权限的文档进入合并，点击合并按钮没有反应
+                        if (!string.IsNullOrEmpty(currentLoadedPassword))
+                        {
+                            mergeObject.Password = currentLoadedPassword;
+                        }
                     }
                     else
                     {

PDF Office/ViewModels/ViewContentViewModel.cs

@@ -1995,7 +1995,7 @@ namespace PDF_Master.ViewModels
         private void TabControlSelectonChangedEvent(object e)
         {
             var args = e as SelectionChangedEventArgs;
-            if (args != null)
+            if (args != null&&args.AddedItems.Count>0)
             {
                 var item = args.AddedItems[0] as TabItem;
                 CurrentBar = item.Name;