TextInputLayout outline mode does not support dynamic boxBackgroundColor via ColorStateList

[reiser002]

Issue Summary

When using TextInputLayout with boxBackgroundMode="outline", the boxBackgroundColor does not respond to ColorStateList changes. This makes it impossible to change the background color dynamically on focus, unlike filled mode which works as expected.

Steps to Reproduce

1. Create a selector color resource with state_focused and default.
2. Set it to app:boxBackgroundColor in XML.
3. Use boxBackgroundMode="outline".

Expected Behavior

The background color of the outlined box should change when focused.

Actual Behavior

Only the default color is applied. Focused state is ignored.

Environment

• Material Components version: [your version]
• Android version: [your device/emulator]
• Theme: Material3 / Material2

Additional Notes

This behavior is inconsistent with filled mode and limits UI flexibility. Please consider adding support for ColorStateList in outline mode.