Input control hints and underline lost when in ColorZone

[cjmurph]

Bug explanation

The hint, underline and cursor on TextBox and ComboBox go to primary brush when selected. The underline goes to primary on mouse over as well. If these controls are within a colorzone, with mode set to mid, these elements disappear on selection/hover.

This is true for various styles such as MaterialDesignFloatingHintTextBox/ComboBox and MaterialDesignOutlinedTextBox/ComboBox

I expect the control to choose a more appropriate highlight color (driven by the colorzone perhaps) or allow the selected highlight color to be overridden.

        <materialDesign:ColorZone Mode="PrimaryMid" Grid.Row="1" Padding="8">
            <StackPanel>
                <TextBox Style="{DynamicResource MaterialDesignFloatingHintTextBox}" Text="Some Value" materialDesign:HintAssist.Hint="Some Hint"/>
                <ComboBox Style="{DynamicResource MaterialDesignFloatingHintComboBox}" SelectedIndex="0" materialDesign:HintAssist.Hint="Some Options">
                    <ComboBox.Items>
                        <ComboBoxItem Content="Stuff"/>
                        <ComboBoxItem Content="Things"/>
                    </ComboBox.Items>
                </ComboBox>
                <TextBox Style="{DynamicResource MaterialDesignOutlinedTextBox}" Text="Some Value" materialDesign:HintAssist.Hint="Some Hint"/>
                <ComboBox Style="{DynamicResource MaterialDesignOutlinedComboBox}" SelectedIndex="0" materialDesign:HintAssist.Hint="Some Options">
                    <ComboBox.Items>
                        <ComboBoxItem Content="Stuff"/>
                        <ComboBoxItem Content="Things"/>
                    </ComboBox.Items>
                </ComboBox>
            </StackPanel>
        </materialDesign:ColorZone>

Version

5.0