Still requires "classy" after composer installation

I have added the classy theme as dependency & added Patch, please review.

Hi, the above patch applied sucessfully and added the dependency in .info.yml file. But we still we need to have classy theme installed in our system via 'composer require 'drupal/classy:^1.0'' to get away with the issue mentioned. While themes themselves are not typically managed through Composer, we can do it only by adding below requirement in root composer of our site:

{
  "require": {
    "drupal/classy": "^1.0"
    // other dependencies...
  }
}