Add spacing between paragraphs in a WPF Document

The following example uses styling to set the margin for all Paragraph elements in a FlowDocument to 0, which effectively eliminates extra spacing between paragraphs in the FlowDocument.

<FlowDocument>
  <FlowDocument.Resources>
    <!-- This style is used to set the margins for all paragraphs in the FlowDocument to 0. -->
    <Style TargetType="{x:Type Paragraph}">
      <Setter Property="Margin" Value="0"/>
    </Style>
  </FlowDocument.Resources>

  <Paragraph>
    Spacing between paragraphs is caused by margins set on the paragraphs.  Two adjacent margins
    will "collapse" to the larger of the two margin widths, rather than doubling up.
  </Paragraph>

  <Paragraph>
    To eliminate extra spacing between two paragraphs, just set the paragraph margins to 0.
  </Paragraph>
</FlowDocument