In semantics.dart line 122 AccessiblityFocusBlockType the spelling of Accessiblity is incorrect and should be: AccessibilityFocusBlockType.

This will be just a Name change across all files and tests, with no functional impact based on my analysis.

I am currently working on another issue, but I can take this up after I finish my other work.

Edit:

Might be a breaking change cause if someone has defined a semantic widget and is already using this then they would need to refactor the codebase after the upgrade