[two_dimensional_scrollables] Fix horizontal scrolled tree view hit testing

[MousyBusiness]

Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.

List which issues are fixed by this PR. You must list at least one issue.

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[gemini-code-assist]

Code Review

This pull request correctly fixes a hit testing issue in TreeView for horizontally scrolled content by updating RenderTreeViewport.hitTestChildren. The version and changelog are also updated. My main feedback is about adding a regression test to ensure this bug doesn't reappear, as detailed in the comment on the CHANGELOG.

[gemini-code-assist]

While this change correctly fixes the hit testing issue, the PR is missing a regression test. As per the repository style guide (line 18), changes should be tested. Please add a test case that involves a horizontally scrolled TreeView to verify this fix and prevent future regressions.

References

1. Code should be tested. This bug fix should be accompanied by a regression test. ^(link)