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To complete the work in PR #166889, this PR ensures that `SliverMainAxisGroup` correctly supports `SliverEnsureSemantics` and respects `cacheExtent` rules within its `visitChildrenForSemantics` implementation. The fix is adapted from `RenderViewPort.visitChildrenForSemantics` code. ## 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.
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