Merge pull request #3530 from Symbai/datagridDarkThemeFix

Fix DataGrid highlight color on white and dark theme v2

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

@@ -45,7 +45,7 @@
 
             <Path Name="SortIcon"
                   Grid.Column="1"
-                  Fill="#FF444444"
+                  Fill="{TemplateBinding Foreground}"
                   HorizontalAlignment="Left"
                   VerticalAlignment="Center"
                   Stretch="Uniform"
@@ -113,7 +113,7 @@
 
   <Style Selector="DataGridRow /template/ Rectangle#BackgroundRectangle">
     <Setter Property="IsVisible" Value="False"/>
-    <Setter Property="Fill" Value="#FFBADDE9" />
+    <Setter Property="Fill" Value="{DynamicResource HighlightBrush}" />
   </Style>
 
   <Style Selector="DataGridRow:pointerover /template/ Rectangle#BackgroundRectangle">
@@ -126,6 +126,10 @@
     <Setter Property="Opacity" Value="1"/>
   </Style>
 
+  <Style Selector="DataGridRow:selected">
+    <Setter Property="Foreground" Value="{DynamicResource HighlightForegroundBrush}" />
+  </Style>
+
   <Style Selector="DataGridRowHeader">
     <Setter Property="Template">
       <ControlTemplate>
@@ -139,7 +143,7 @@
   </Style>
 
   <Style Selector="DataGridRowGroupHeader">
-    <Setter Property="Background" Value="#FFE4E8EA" />
+    <Setter Property="Background" Value="{DynamicResource ThemeControlMidHighBrush}" />
     <Setter Property="Height" Value="20"/>
     <Setter Property="Template">
       <ControlTemplate>
@@ -148,7 +152,6 @@
                                  ColumnDefinitions="Auto,Auto,Auto,Auto"
                                  RowDefinitions="Auto,*,Auto">
 
-          <Rectangle Grid.Column="1" Grid.ColumnSpan="5" Fill="#FFFFFFFF" Height="1"/>
           <Rectangle Grid.Column="1" Grid.Row="1" Name="IndentSpacer" />
           <ToggleButton Grid.Column="2" Grid.Row="1" Name="ExpanderButton" Margin="2,0,0,0"/>
 
@@ -169,7 +172,7 @@
     <Setter Property="Template">
       <ControlTemplate>
         <Border Grid.Column="0" Width="20" Height="20" Background="Transparent" HorizontalAlignment="Center" VerticalAlignment="Center">
-          <Path Fill="Black"
+          <Path Fill="{TemplateBinding Foreground}"
                 HorizontalAlignment="Center"
                 VerticalAlignment="Center"
                 Data="M 0 2 L 4 6 L 0 10 Z" />