Two races in the chain theme about elvish-themes HOT 3 CLOSED

@krader1961 thanks for the report - I had never noticed the first race condition since I don't use a right-side prompt :)

I agree with your proposed solution, so I have added it to the module. I think this might also be "good enough" without calling gitstatus:start after load, since this would also need to check if any git segments are present, and it might still miss if the segments are changed afterwards. Assuming git segments are only on one side, then the new check in -build-chain will also ensure gitstatus is only started once.

I would appreciate your feedback if you continue to see some problems.

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I updated to the current version a few minutes ago and things look good. No unexpected exceptions and the new chain:prompt-segment-delimiters var works fine.

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@krader1961 I was thinking that if someone wanted to have git segments on both sides, you could work around the issue by manually starting gitstatusd after loading the theme, e.g:

use github.com/zzamboni/elvish-themes/chain
chain:gitstatus:start

I am going to document this, in case anyone encounters this issue.

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