[WPF]MenuItem右侧空白

<Window>
    <Grid Background="SteelBlue">
        <Grid.ContextMenu>
            <ContextMenu>
                <MenuItem Header="右侧空白"/>
                <MenuItem Header="右侧空白"/>
                <MenuItem Header="右侧空白"/>
            </ContextMenu>
        </Grid.ContextMenu>
    </Grid>
</Window>

<Window>
    <Grid Background="SteelBlue">
        <Grid.ContextMenu>
            <ContextMenu>
                <MenuItem Header="右侧真的存在空白"/>
                <MenuItem Header="右侧真的存在空白"/>
                <MenuItem Header="右侧真的存在空白"/>
            </ContextMenu>
        </Grid.ContextMenu>
    </Grid>
</Window>

<Window>
    <Grid Background="SteelBlue">
        <Grid.ContextMenu>
            <ContextMenu>
                <ContextMenu.ItemContainerStyle>
                    <Style TargetType="MenuItem">
                        <Setter Property="Padding" Value="5,4,-80,0"/>
                        <Setter Property="Width" Value="130"/>
                    </Style>
                </ContextMenu.ItemContainerStyle>
                <MenuItem Header="右侧好像没有空白"/>
                <MenuItem Header="右侧好像没有空白"/>
                <MenuItem Header="右侧好像没有空白"/>
            </ContextMenu>
        </Grid.ContextMenu>
    </Grid>
</Window>