Fix TextBox horizontal scrollbar position when VerticalContentAlignment is set to Top

Author: database64128

src/MainDemo.Wpf/Fields.xaml

@@ -340,12 +340,14 @@
 
           <TextBox Height="100"
                    VerticalAlignment="Top"
+                   VerticalContentAlignment="Top"
                    materialDesign:HintAssist.Hint="This is a text area"
                    AcceptsReturn="True"
                    IsEnabled="{Binding Path=IsChecked, ElementName=MaterialDesignOutlinedTextBoxEnabledComboBox}"
                    Style="{StaticResource MaterialDesignOutlinedTextBox}"
-                   TextWrapping="Wrap"
-                   VerticalScrollBarVisibility="Auto" />
+                   TextWrapping="NoWrap"
+                   VerticalScrollBarVisibility="Auto"
+                   HorizontalScrollBarVisibility="Auto" />
         </StackPanel>
       </smtx:XamlDisplay>
 

src/MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.TextBox.xaml

@@ -132,8 +132,7 @@
                       SnapsToDevicePixels="True">
 
                 <Grid x:Name="ContentGrid"
-                      MinHeight="16"
-                      VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
+                      MinHeight="16">
                   <Grid.ColumnDefinitions>
                     <ColumnDefinition Width="Auto" />
                     <ColumnDefinition Width="Auto" />
@@ -156,7 +155,7 @@
                   <ScrollViewer x:Name="PART_ContentHost"
                                 Grid.Column="2"
                                 HorizontalAlignment="Stretch"
-                                VerticalAlignment="Center"
+                                VerticalAlignment="Stretch"
                                 HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
                                 VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
                                 Panel.ZIndex="1"