Question: Adjustments to Rainbow on MUXTestApp Flyout Pages

[mdtauk]

This is just a quick Question/Proposal for the Rainbow LinearGradientBrush used for the CommandBarFlyout and MenuFlyout TestUI pages in the MUXTestApp.

@llongley Would switching to this rainbow gradient, be a better test for these pages, so the blurring effect is more noticeable with the Acrylic material? You added these with this commit and PR #5179

            <LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
                <GradientStop Color="Red" Offset="0.000" />
                <GradientStop Color="Red" Offset="0.166" />
                <GradientStop Color="DarkOrange" Offset="0.167" />
                <GradientStop Color="DarkOrange" Offset="0.332" />
                <GradientStop Color="Goldenrod" Offset="0.333" />
                <GradientStop Color="Goldenrod" Offset="0.499" />
                <GradientStop Color="SeaGreen" Offset="0.500" />
                <GradientStop Color="SeaGreen" Offset="0.666" />
                <GradientStop Color="MediumBlue" Offset="0.667" />
                <GradientStop Color="MediumBlue" Offset="0.832" />
                <GradientStop Color="Indigo" Offset="0.833" />
                <GradientStop Color="Indigo" Offset="1.000" />
            </LinearGradientBrush>

[StephenLPeters]

I like this, could you submit a PR?

[mdtauk]

I like this, could you submit a PR?

Ok... I hope I have done this right.
#5219