Updates logic to account for margin on ComboBox toggleButton and ComboBox PART_ClearButton based on margin on ComboBox InnerRoot (#2463)

The Top Margin (indicating the floatingHintOffset) is set on the InnerRoot when the HintAssist.IsFloting is set

Author: guptaanmol184

MaterialDesignThemes.Wpf/Converters/ComboBoxClearButtonMarginConverter.cs

@@ -11,9 +11,10 @@ public object Convert(object[] values, Type targetType, object parameter, Cultur
         {
             var padding = (Thickness)values[0];
             var borderThickness = (Thickness)values[1];
+            var floatingHintTopOffset = ((Thickness)values[2]).Top;
             return new Thickness(
                 borderThickness.Left,
-                borderThickness.Top + padding.Top,
+                borderThickness.Top + padding.Top + floatingHintTopOffset,
                 borderThickness.Right + padding.Right + Constants.ComboBoxArrowSize + Constants.TextBoxInnerButtonSpacing,
                 borderThickness.Bottom + padding.Bottom);
         }

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.ComboBox.xaml

@@ -312,7 +312,8 @@
                     Style="{StaticResource MaterialDesignComboBoxToggleButton}"
                     BorderBrush="{TemplateBinding BorderBrush}"
                     Background="{TemplateBinding Background}"
-                    Padding="{TemplateBinding Padding}" />
+                    Padding="{TemplateBinding Padding}"
+                    Margin="{Binding ElementName=InnerRoot, Path=Margin}"/>
                 <Border
                     x:Name="templateRoot"
                     BorderBrush="{TemplateBinding BorderBrush}"
@@ -478,6 +479,7 @@
                         <MultiBinding Converter="{StaticResource ComboBoxClearButtonMarginConverter}">
                             <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="Padding" />
                             <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="BorderThickness" />
+                            <Binding ElementName="InnerRoot" Path="Margin" />
                         </MultiBinding>
                     </Button.Margin>
                     <Button.Visibility>