ad009fb7ac
fixes https://github.com/flutter/flutter/issues/123112
### Description
1. Add proper M3 indicator height aka`IndictorWeight` from the M3 specs for the primary tab bar with label indicator size.
db6074ade4/dev/tools/gen_defaults/data/navigation_tab_primary.json (L9)
(this was held due to `indicatorWeight` having a hard-coded value)
and added a secondary tab bar indicator height.
2. Set a minimum value for the rounded indicator to maintain the indicator shape.
3. With proper indicator height, the rounded indicator position is also fixed.
4. Fix round indicator is shown for the primary tab bar with tab indicator size.
5. Above changes fix https://github.com/flutter/flutter/issues/123112.
6. Fix the `startOffset` const value from https://github.com/flutter/flutter/pull/125036 to match docs and move it to a variable.
Token Defaults Generator
Script that generates widget component theme data defaults based on the Material Token database. These tokens were extracted into a JSON file from an internal Google database.
Usage
Run this program from the root of the git repository:
dart dev/tools/gen_defaults/bin/gen_defaults.dart
Templates
There is a template file for every component that needs defaults from
the token database. These templates are implemented as subclasses of
TokenTemplate. This base class provides some utilities and a structure
for adding a new block of generated code to the bottom of a given file.
Templates need to override the generate method to provide the generated
code block as a string. The tokens are represented as a Map<String, dynamic>
that is loaded from data/material-tokens.json. Templates can look up
whatever properties are needed in this structure to provide the properties
needed for the component.
See lib/fab_template.dart for an example that generates defaults for the
Floating Action Button.