Extracts Tab2ConversationRow class that consolidates widget tree for a
chat message in the Cupertino navagation chat demo. This refactoring
simplifies adding SafeArea support to handle iOS 11 safe areas in a
followup patch.
* Let lists automatically add sliver padding from media query. Translucent nav and tab bars leave behind media query paddings in scaffolds.
* tests
* const lint
* Rename base abstract class to generalized ObstructingPreferredSizeWidget
* Built first tab
* Small additions
* started tab 3
* Need color arithmetics
* tab 2 built
* finalize
* lint and tests
* review
* Reapply docs after rebase
* use color.computeLuminance
* linter
* nit
* Add cupertino to gallery and add CupertinoButto
* Use single quotes
* Add disabled state
* Some review notes
* Make button animation more responsive and tweak timing
* Renamed things Cupertino
* Button with background, move cupertino demos, move material demos
* Move 2 level list too
* Refactor various demo route names
* Some review notes
* More reviews and add test
* Linter as
* Move private constant up