Why does TextInput disabled outline return transparent in Dark theme (getOutlinedOutlineInputColor) ?

[LerchT]

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While using TextInput (mode="outlined") in React Native Paper with a custom dark theme, I noticed that disabled inputs don’t render an outline border.

After checking the source code, the reason seems to come from getOutlinedOutlineInputColor in Helper.tsx inside the TextInput directory :

const getOutlinedOutlineInputColor = ({
  theme,
  disabled,
  customOutlineColor,
}: BaseProps & { customOutlineColor?: string }) => {
  const isTransparent = color(customOutlineColor).alpha() === 0;

  if (!disabled && customOutlineColor) {
    return customOutlineColor;
  }

  if (theme.isV3) {
    if (disabled) {
      if (theme.dark) {
        return 'transparent';
      }
      return theme.colors.surfaceDisabled;
    }

    return theme.colors.outline;
  }

  if (disabled) {
    if (isTransparent) {
      return customOutlineColor;
    }
    return theme.colors.disabled;
  }
  return theme.colors.placeholder;
};

My Expectation
In dark mode, I would expect the disabled border to use something like theme.colors.surfaceDisabled (similar to light mode), instead of transparent.
This way, the outline remains visible and consistent with Material guidelines.

Question
Is the transparent return for dark mode intentional?
If yes, what’s the recommended way to override it so that disabled inputs still have a visible outline in dark theme?
Would you accept a PR that aligns the behavior with light mode (surfaceDisabled)?

Environment
react-native-paper: 5.14.5
react-native: 0.79.5
Platform: Android & iOS