Loosen the constraints for Stack non-positioned children. (#9581)

Also:

 * Add three explicit sizing modes to Stack for non-positioned
   children: loose, expand, and passthrough. (All three are used.)

 * Fix a bug whereby layers would try to paint in the same frame as
   they were removed from layout (but not detached).

 * Fix a bug whereby Offstage wasn't properly marking the parent dirty
   when changing its sizedByParent flag.

 * Explicitly make Overlay expand non-positioned children.

 * Explicitly have InputDecoration pass through the constraints from
   its Row to its Stack children.
14 files changed
tree: 4194894eb1b862f9f4aeaf453b1b2edd19b073fc
  1. .idea/
  2. bin/
  3. dev/
  4. examples/
  5. packages/
  6. .analysis_options
  7. .analysis_options_repo
  8. .gitattributes
  9. .gitignore
  10. .travis.yml
  11. appveyor.yml
  12. AUTHORS
  13. CONTRIBUTING.md
  14. ISSUE_TEMPLATE.md
  15. LICENSE
  16. PATENTS
  17. README.md
  18. VERSION
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