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POResizable WPF Grid inserts blank lines between rows and columns depending on actual size
 

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    <p>I have a <code>Grid</code> displaying rectangles. The <code>Grid</code> can be resized and is supposed to display adjacent rectangles without any gap.</p> <p>However, depending on the actual size of the <code>Grid</code>, blank lines appear between the rows and columns of the <code>Grid</code>. I guess this is to make up for sizes where the width isn't a multiple of the number of columns, or the height isn't a multiple of the number of rows.</p> <p>The following XAML code demonstrates this:</p> <pre><code>&lt;Window x:Class="test.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition&gt;&lt;/ColumnDefinition&gt; &lt;ColumnDefinition&gt;&lt;/ColumnDefinition&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition&gt;&lt;/RowDefinition&gt; &lt;RowDefinition&gt;&lt;/RowDefinition&gt; &lt;/Grid.RowDefinitions&gt; &lt;Rectangle Grid.Column="0" Grid.Row="0" Fill="DarkBlue"&gt;&lt;/Rectangle&gt; &lt;Rectangle Grid.Column="1" Grid.Row="0" Fill="DarkOrange"&gt;&lt;/Rectangle&gt; &lt;Rectangle Grid.Column="0" Grid.Row="1" Fill="DarkBlue"&gt;&lt;/Rectangle&gt; &lt;Rectangle Grid.Column="1" Grid.Row="1" Fill="DarkBlue"&gt;&lt;/Rectangle&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>How can I prevent those blank lines? If one or some of the columns/rows are slightly larger than others is not really a problem. I'd like to keep the markup simple.</p> <p>I unsuccessfully tried <code>Stretch</code>, <code>Fill</code>, putting the <code>Grid</code> in a <code>ViewBox</code>, <code>ShowGridLines=False, Width=Auto</code>, etc.</p> <p>An image of the issue is as follows:</p> <p><img src="https://i.stack.imgur.com/qXkdt.png" alt="enter image description here"></p>
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