win2d -> skia, some improvements on rendering.

Wino.Calendar.ViewModels/CalendarAppShellViewModel.cs

@@ -150,7 +150,7 @@ public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
 
     private async Task InitializeAccountCalendarsAsync()
     {
-        await Dispatcher.ExecuteOnUIThread(() => AccountCalendarStateService.ClearGroupedAccountCalendar());
+        await Dispatcher.ExecuteOnUIThread(() => AccountCalendarStateService.ClearGroupedAccountCalendars());
 
         var accounts = await _accountService.GetAccountsAsync().ConfigureAwait(false);
 

Wino.Calendar.ViewModels/CalendarPageViewModel.cs

@@ -611,8 +611,6 @@ public partial class CalendarPageViewModel : CalendarBaseViewModel,
         }
     }
 
-
-
     private async Task InitializeCalendarEventsForDayRangeAsync(DayRangeRenderModel dayRangeRenderModel)
     {
         // Clear all events first for all days.
@@ -626,9 +624,8 @@ public partial class CalendarPageViewModel : CalendarBaseViewModel,
 
         // Initialization is done for all calendars, regardless whether they are actively selected or not.
         // This is because the filtering is cached internally of the calendar items in CalendarEventCollection.
-        var allCalendars = AccountCalendarStateService.GroupedAccountCalendars.SelectMany(a => a.AccountCalendars);
 
-        foreach (var calendarViewModel in allCalendars)
+        foreach (var calendarViewModel in AccountCalendarStateService.AllCalendars)
         {
             // Check all the events for the given date range and calendar.
             // Then find the day representation for all the events returned, and add to the collection.

Wino.Calendar.ViewModels/Data/GroupedAccountCalendarViewModel.cs

@@ -69,10 +69,10 @@ public partial class GroupedAccountCalendarViewModel : ObservableObject
     }
 
     [ObservableProperty]
-    private bool _isExpanded = true;
+    public partial bool IsExpanded { get; set; } = true;
 
     [ObservableProperty]
-    private bool? isCheckedState = true;
+    public partial bool? IsCheckedState { get; set; } = true;
 
     private bool _isExternalPropChangeBlocked = false;
 

Wino.Calendar.ViewModels/Interfaces/IAccountCalendarStateService.cs

@@ -15,7 +15,7 @@ public interface IAccountCalendarStateService : INotifyPropertyChanged
 
     public void AddGroupedAccountCalendar(GroupedAccountCalendarViewModel groupedAccountCalendar);
     public void RemoveGroupedAccountCalendar(GroupedAccountCalendarViewModel groupedAccountCalendar);
-    public void ClearGroupedAccountCalendar();
+    public void ClearGroupedAccountCalendars();
 
     public void AddAccountCalendar(AccountCalendarViewModel accountCalendar);
     public void RemoveAccountCalendar(AccountCalendarViewModel accountCalendar);
@@ -24,5 +24,5 @@ public interface IAccountCalendarStateService : INotifyPropertyChanged
     /// Enumeration of currently selected calendars.
     /// </summary>
     IEnumerable<AccountCalendarViewModel> ActiveCalendars { get; }
-    // IEnumerable<IGrouping<MailAccount, AccountCalendarViewModel>> GroupedAccountCalendarsEnumerable { get; }
+    IEnumerable<AccountCalendarViewModel> AllCalendars { get; }
 }