Qun Cheng 08e122f466
Add error description for nbsp character(\u202f) (#178895)
This PR is to add a more clear error description when there is a special
white space NNBSP(\u202f). This whitespace character is used to connect
time and "am"/"pm".

In this PR, I only updated the description in `_MatchesSemanticsData`
and still not sure if it's necessary to create another custom matcher
class to ignore special whitespace. I think it's valid to directly
update users' test results since the expected results have indeed
changed.

This is my experiment for the whitespace change when we update
generated_date_localization.dart: cl/831625146
I went through all Scuba diffs and all results look expected. Once this
is landed, we can use the CL change (except the image change) as g3fix
to update the date localizations.

Fixes https://github.com/flutter/flutter/issues/177479

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.
2025-12-22 21:04:06 +00:00
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