Decoupling Material

[justinmc]

This is the mega PR that attempts to import all of Material into material_ui.

To create this PR I followed this process using the following command:

git filter-repo --path packages/flutter/lib/src/material --path examples/api/lib/material

TODOs

• Export m3 from material_ui.dart.
• Export everything from m3.dart.
• Try installing and using the package locally.
• Verify examples work.
• Verify that git blame appears the same in both repos on various files.

Open questions

• Are we sure about the directory structure?
  • What happens when a user imports material_ui.dart and there are things with the same name in both m3 and m3e?
• Anything else that should be ported along with this? If these commits touch files that are not included in this PR, but that we later port in, the commits will likely have different SHAs.
• Should we actually have a combined material_ui and cupertino_ui mega mega PR so that the commit SHAs align between both of them?

Resources

• Closed PR where I tried and failed to import a single widget by individually importing all of its transitive dependencies with git filter-repo commands.
  • Decoupling Material's ProgressIndicator #11526
• Closed PR where I tried to import just colors.dart (no dependencies), but found that it would create different SHAs between it and this mega PR.
  • Decoupling Material's colors.dart #11543