Input control hints and underline lost when in ColorZone

还没有人认领这个 Issue。

### 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.


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### Version

5.0

从 ColorZone 样式以及 MaterialDesignFloatingHint/Outlined TextBox 和 ComboBox 样式定义入手；使用 ColorZone Mode="PrimaryMid" 复现提供的 XAML，并检查悬停或选择时用于提示、下划线和光标的 brushes。完成标准是：在所列样式中，这些元素始终以适当的或可覆盖的高亮颜色保持可见；如果项目提供回归测试，则应包含回归测试覆盖。

由索引模型根据 Issue 内容生成。