Ayyoub Kouadir c82cf49b6c
Fix ListTile overwriting parent IconButtonTheme for its children (#167727) (#168480)
### Description

ListTile was recreating its own IconButtonThemeData—discarding any
styles inherited from an existing IconButtonTheme above it. This change
makes ListTile merge its theme data with the inherited one instead of
replacing it, so child IconButtons now correctly pick up parent styling

issue: https://github.com/flutter/flutter/issues/167727

---
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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.

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[Data Driven Fixes]:
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2025-05-09 17:23:34 +00:00
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