Description

Revised the cupertino picker and date time picker

• Add a new squeeze argument to RenderListWheelViewport to customize angular density on the cylinder
• Add text theming support to pickers
• Add today label for date time picker
• Small tweaks on various picker/date time picker parameters
• Add a check to make sure enough horizontal space is available to show the picker

Before:

After:

Tests

I added the following tests:

• squeeze test in list_wheel_scroll_view_test
• font test in picker_test

Checklist

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• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I signed the CLA.
• I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
• I updated/added relevant documentation (doc comments with ///).
• All existing and new tests are passing.
• The analyzer (flutter analyze --flutter-repo) does not report any problems on my PR.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

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• Yes, this is a breaking change (Please read Handling breaking changes). Replace this with a link to the e-mail where you asked for input on this proposed change.
• No, this is not a breaking change.