回答編集履歴
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InkCanvas由来の問題として回答内容を丸ごと修正
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InkCanvasと同時にPointerMovedなど入力イベントを扱う場合は`InkCanvas.InkPresenter.UnprocessedInput`を通じて入力にアクセス出来るようです。
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UWP アプリでのペン操作と Windows Ink（高度な処理のための入力のパススルー）
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また蛇足ですが、イベントハンドラーは`Grid`に対して異なるイベントであれば一括で設定できます。ですので今回の場合`Grid`をいくつもネスト（入れ子）して配置する必要はありません。
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`Canvas_PointerMoved`と`Grid_PointerMoved`は同じタイミングで呼ばれるため、処理を統合したほうがいいかと思います。
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```
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<Page
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x:Class="UWPApp1.BlankPage1"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:local="using:UWPApp1"
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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mc:Ignorable="d"
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Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
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<Grid PointerMoved="Grid_PointerMoved"
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PointerReleased="Canvas_PointerReleased"
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PointerPressed="Canvas_PointerPressed"
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Background="White"
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IsHitTestVisible="True"
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>
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<Grid>
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<Grid.RowDefinitions>
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<RowDefinition Height="Auto"/>
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<RowDefinition Height="*"/>
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</Grid.RowDefinitions>
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<StackPanel x:Name="HeaderPanel"
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Orientation="Horizontal"
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Grid.Row="0">
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<TextBlock x:Name="Header"
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Style="{ThemeResource HeaderTextBlockStyle}"
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Margin="10,0,0,0" SelectionChanged="Header_SelectionChanged" >
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<Run Text="描画してください"/>
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<LineBreak/>
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<Run/>
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</TextBlock>
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<TextBlock x:Name="text_position" TextWrapping="Wrap" Text="TextBlock" FontSize="24"/>
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<TextBlock x:Name="text_isPointerOn" TextWrapping="Wrap" Text="TextBlock" FontSize="24"/>
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</StackPanel>
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<Grid x:Name="drawingCanvas" Grid.Row="1" FocusVisualPrimaryBrush="Black">
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<Grid.ColumnDefinitions>
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<ColumnDefinition Width="0*"/>
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<ColumnDefinition/>
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</Grid.ColumnDefinitions>
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<Grid.FocusVisualSecondaryBrush>
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<AcrylicBrush/>
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</Grid.FocusVisualSecondaryBrush>
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<!-- The canvas where we render the replacement text and shapes. -->
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<!-- The canvas for ink input. -->
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<InkCanvas x:Name="inkCanvas" Grid.ColumnSpan="2" Margin="6,0,-6,0" FocusVisualPrimaryBrush="{x:Null}" FocusVisualSecondaryBrush="{x:Null}" Opacity="0.5" />
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<!-- The canvas where we render the replacement text and shapes. -->
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<Canvas x:Name="recognitionCanvas" Grid.ColumnSpan="2" />
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<!-- The canvas for ink input. -->
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</Grid>
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</Grid>
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<Canvas HorizontalAlignment="Left" VerticalAlignment="Top">
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<Ellipse
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Stroke="#FF044B0A" FocusVisualPrimaryBrush="{x:Null}" FocusVisualSecondaryBrush="{x:Null}" Margin="132,189,-132,-189"
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Height="187" Width="189" RenderTransformOrigin="0.5,0.5" Visibility="Visible" RequestedTheme="Light" Canvas.Left="99" Canvas.Top="162" UseLayoutRounding="False" d:LayoutRounding="Auto"
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>
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<Ellipse.RenderTransform>
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<CompositeTransform Rotation="-0.481"/>
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</Ellipse.RenderTransform>
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</Ellipse>
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</Canvas>
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<Button Content="Button" Margin="118,63,0,0" VerticalAlignment="Top" RenderTransformOrigin="-3.172,0.297" Click="Button_Click"/>
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<TextBlock HorizontalAlignment="Left" Margin="121,91,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Height="24">
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<Run Text="戻るボタン"/>
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<LineBreak/>
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<Run/>
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</TextBlock>
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</Grid>
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</Page>
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```
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[https://docs.microsoft.com/ja-jp/windows/uwp/design/input/pen-and-stylus-interactions#pass-through-input-for-advanced-processing](https://docs.microsoft.com/ja-jp/windows/uwp/design/input/pen-and-stylus-interactions#pass-through-input-for-advanced-processing)
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