Multi progress bar does not update drawing current / total values properly about tty-progressbar HOT 4 CLOSED

Thanks for using the gem and reporting this issue!

Great spot. Do you have time to submit PR? Even a test demonstrating the issue will be good?

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Honestly I don't have time for a PR, but I'll take a look into this when I get a chance.

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If I insert byebug after the 2nd register call in #fetch method, and check @multibar.total it correctly says 21 so I think this is issue with redrawing the top bar when its children are updated.

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Some notes for people who may be reading this issue. The original intention behind multi progress bars was to track the execution of multiple tasks/jobs concurrently. The provided example is a synchronous set of steps that the gem hasn't been designed for. The following would work as expected when converted to separate threads of execution:

class FetchPackages
  def run
    @multibar = TTY::ProgressBar::Multi.new('Fetching packages (:current/:total)')
    th_valid = Thread.new { validate_local_cache }
    th_fetch = Thread.new { fetch }
    th_valid.join
    th_fetch.join
  end
  ...

Though this would fail in the given scenario as the fetching would happen before validation. There's a new resume api that will help stop and resume single progress bars. This call will automatically trigger when a multi-bar is in use.

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