VRCMelonAssistant/VRCMelonAssistant/Styles/ComboBoxItem.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style x:Key="{x:Type ComboBoxItem}" TargetType="ComboBoxItem">
        <Setter Property="UIElement.SnapsToDevicePixels" Value="True" />
        <Setter Property="Padding" Value="4,1" />
        <Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" />
        <Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" />
        <Setter Property="Background" Value="{DynamicResource ComboBoxBackground}" />
        <Setter Property="BorderBrush" Value="Transparent" />
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ComboBoxItem}">
                    <Border
                        Name="Bd"
                        Padding="{TemplateBinding Padding}"
                        Background="{DynamicResource ComboBoxBackground}"
                        BorderBrush="{DynamicResource ComboBoxOutline}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        SnapsToDevicePixels="True">
                        <ContentPresenter
                            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                            SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsEnabled" Value="False">
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource SystemColors.GrayTextBrushKey}" />
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="ListBoxItem.IsSelected" Value="False" />
                                <Condition Property="UIElement.IsMouseOver" Value="True" />
                                <Condition Property="UIElement.IsKeyboardFocused" Value="False" />
                            </MultiTrigger.Conditions>
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource ComboBoxHighlighted}" />
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="ListBoxItem.IsSelected" Value="True" />
                                <Condition Property="UIElement.IsMouseOver" Value="False" />
                                <Condition Property="UIElement.IsKeyboardFocused" Value="True" />
                            </MultiTrigger.Conditions>
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource ComboBoxSelected}" />
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="ListBoxItem.IsSelected" Value="True" />
                                <Condition Property="UIElement.IsMouseOver" Value="True" />
                            </MultiTrigger.Conditions>
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource ComboBoxSelected}" />
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="ListBoxItem.IsSelected" Value="True" />
                                <Condition Property="UIElement.IsMouseOver" Value="False" />
                                <Condition Property="UIElement.IsKeyboardFocused" Value="False" />
                            </MultiTrigger.Conditions>
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource ComboBoxSelected}" />
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="ListBoxItem.IsSelected" Value="False" />
                                <Condition Property="UIElement.IsMouseOver" Value="False" />
                                <Condition Property="UIElement.IsKeyboardFocused" Value="True" />
                            </MultiTrigger.Conditions>
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource ComboBoxHighlighted}" />
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="ListBoxItem.IsSelected" Value="False" />
                                <Condition Property="UIElement.IsMouseOver" Value="True" />
                                <Condition Property="UIElement.IsKeyboardFocused" Value="True" />
                            </MultiTrigger.Conditions>
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource ComboBoxHighlighted}" />
                        </MultiTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>