Merge branch 'master' into combox_selection

src/Avalonia.Controls.DataGrid/Themes/Fluent.xaml

@@ -6,8 +6,8 @@
 
     <StreamGeometry x:Key="DataGridSortIconDescendingPath">M1875 1011l-787 787v-1798h-128v1798l-787 -787l-90 90l941 941l941 -941z</StreamGeometry>
     <StreamGeometry x:Key="DataGridSortIconAscendingPath">M1965 947l-941 -941l-941 941l90 90l787 -787v1798h128v-1798l787 787z</StreamGeometry>
-    <StreamGeometry x:Key="DataGridRowGroupHeaderIconClosedPath">M515 93l930 931l-930 931l90 90l1022 -1021l-1022 -1021z</StreamGeometry>
-    <StreamGeometry x:Key="DataGridRowGroupHeaderIconOpenedPath">M109 486 19 576 1024 1581 2029 576 1939 486 1024 1401z</StreamGeometry>
+    <StreamGeometry x:Key="DataGridRowGroupHeaderIconOpenedPath">M515 93l930 931l-930 931l90 90l1022 -1021l-1022 -1021z</StreamGeometry>
+    <StreamGeometry x:Key="DataGridRowGroupHeaderIconClosedPath">M109 486 19 576 1024 1581 2029 576 1939 486 1024 1401z</StreamGeometry>
 
     <SolidColorBrush x:Key="DataGridColumnHeaderForegroundBrush" Color="{DynamicResource SystemBaseMediumColor}" />
     <SolidColorBrush x:Key="DataGridColumnHeaderBackgroundBrush" Color="{DynamicResource SystemAltHighColor}" />

src/Windows/Avalonia.Win32/TrayIconImpl.cs

@@ -19,7 +19,6 @@ namespace Avalonia.Win32
     public class TrayIconImpl : ITrayIconImpl
     {
         private static readonly IntPtr s_emptyIcon = new System.Drawing.Bitmap(32, 32).GetHicon();
-        
         private readonly int _uniqueId;
         private static int s_nextUniqueId;
         private bool _iconAdded;
@@ -137,6 +136,12 @@ namespace Avalonia.Win32
 
         private void OnRightClicked()
         {
+            var menuItems = _exporter.GetMenu();
+            if (null == menuItems || menuItems.Count == 0)
+            {
+                return;
+            }
+
             var _trayMenu = new TrayPopupRoot()
             {
                 SystemDecorations = SystemDecorations.None,
@@ -145,7 +150,7 @@ namespace Avalonia.Win32
                 TransparencyLevelHint = WindowTransparencyLevel.Transparent,
                 Content = new TrayIconMenuFlyoutPresenter()
                 {
-                    Items = _exporter.GetMenu()
+                    Items = menuItems
                 }
             };