Support for line breaks

[chucker]

It would be nice to have multiline text in the <TaskDialog.Content> and <TaskDialogButton.Description> elements. A nice XAML-esque way would be something like this:

    <TaskDialog.Content>
        <TaskDialogText>
            <TaskDialogRun>
                Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
                eiusmod tempor incididunt ut labore et dolore magna aliqua.
            </TaskDialogRun>

            <TaskDialogLineBreak />

            <TaskDialogRun>
                Ut enim ad minim veniam, quis nostrud exercitation ullamco
                laboris nisiut aliquip ex ea commodo consequat. Duis aute
                irure dolor in reprehenderit in voluptate velit esse cillum
                dolore eu fugiat nulla pariatur. Excepteur sint 
                cupidatat non proident, sunt in culpa qui officia deserunt
                mollit anim id est laborum.
            </TaskDialogRun>
        </TaskDialogText>
    </TaskDialog.Content>

(Notice the <TaskDialogLineBreak /> element.)

As an alternative, I can use xml:space="preserve":

    <TaskDialog.Content>
        <TaskDialogText>
            <TaskDialogRun xml:space="preserve">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.

Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisiut aliquip ex ea commodo consequat. Duis auteirure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</TaskDialogRun>
        </TaskDialogText>
    </TaskDialog.Content>

However, this makes the markup less readable.

(It also doesn't appear to work on a TaskDialogButton. I haven't found a way to make a multi-line description of command buttons.)