HorizontalContentAlignment of ListBox in AutoSuggestBox

[corvinsz]

Bug explanation

Currently consumers can't alter the HorizontalContentAlignment of the ListBox in the AutoSuggestBox:

Should be self-explanatory, but here is the (non-minimal) repro:

<materialDesign:AutoSuggestBox Margin="{StaticResource DefaultSpacing}"
                               HorizontalAlignment="Stretch"
                               materialDesign:HintAssist.Hint="Username or E-Mail"
                               materialDesign:TextFieldAssist.HasLeadingIcon="True"
                               materialDesign:TextFieldAssist.LeadingIcon="User"
                               DropDownBackground="{DynamicResource MaterialDesign.Brush.ToolBar.Background}"
                               DropDownElevation="Dp24"
                               DropDownMaxHeight="500"
                               Suggestions="{Binding EmailSuggestions}"
                               Text="{Binding Email, UpdateSourceTrigger=PropertyChanged}">
  <materialDesign:AutoSuggestBox.InputBindings>
    <KeyBinding Key="Enter" Command="{Binding LoginCommand}" />
  </materialDesign:AutoSuggestBox.InputBindings>
  <materialDesign:AutoSuggestBox.ItemTemplate>
    <DataTemplate>
      <Grid HorizontalAlignment="Stretch" utils:GridAssist.Columns="*, auto" Background="Fuchsia">
        <TextBlock Grid.Column="0" Text="{Binding .}" VerticalAlignment="Center" />
        <Button Grid.Column="1"
                Padding="2,0,0,0"
                Command="{Binding DataContext.RemoveSuggestion, RelativeSource={RelativeSource AncestorType=UserControl}}"
                Focusable="False"
                Style="{StaticResource MaterialDesignToolButton}">
          <materialDesign:PackIcon Width="16"
                                   Height="16"
                                   Margin="0"
                                   Kind="CloseCircle" />
        </Button>
      </Grid>
    </DataTemplate>
  </materialDesign:AutoSuggestBox.ItemTemplate>
</materialDesign:AutoSuggestBox>

Version

5.3.0-ci1132

[madenaras]

Just use

<materialDesign:AutoSuggestBox.ItemContainerStyle>
     <Style TargetType="ListBoxItem" BasedOn="{StaticResource MaterialDesignListBoxItem}">
           <Setter Property="HorizontalAlignment" Value="Stretch" />
    </Style>
</materialDesign:AutoSuggestBox.ItemContainerStyle>

[corvinsz]

Just use

<materialDesign:AutoSuggestBox.ItemContainerStyle>
     <Style TargetType="ListBoxItem" BasedOn="{StaticResource MaterialDesignListBoxItem}">
           <Setter Property="HorizontalAlignment" Value="Stretch" />
    </Style>
</materialDesign:AutoSuggestBox.ItemContainerStyle>

While this works, it's in my opinion just a workaround.
If you for example look at how it's done in other controls, the ComboBox for example stretches it's content horizontally and vertically by default. (I know it doesn't use a ListBox internally, but my point is the visual appearance, not the implementation detail)

I currently don't see a reason to not implement the same behavior in the AutoSuggestBox?