Bruno Leroux b201fbdee5
Fix InputDecorator default hint text style on M3 (#148944)
## Description

This PRs makes the `InputDecoration.hintText` style compliant with the M3 spec.
The hint style is not clearly specified in https://m3.material.io/components/text-fields/specs, but it is in the M3 Figma kit.
('hint' terminology came from the Material1 specification, since M2 the terminology is 'Placeholder').

See this Figma screenshot taken while focusing on the 'Placeholder' text (which corresponds to hint).

![image](https://github.com/flutter/flutter/assets/840911/58d3d5c9-0984-497a-9d47-4724dcd7b2b3)

It seems that the intention is that the 'Placeholder' colors should be the same as the 'supporting text' ones, that is why is reused 'supporting text' tokens.

## Related Issue

Fixes https://github.com/flutter/flutter/issues/148787.

## Tests

Updates several tests.
2024-05-31 20:56:07 +00:00
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