Mathias Fredriksson e06fd4af63 Check for git arrows asynchronously (#272) ...

Previously `command git rev-list --left-right --count HEAD...@'{u}'`
was run in a subshell, and upon `git fetch` completion, run once again.
This is now done as an async job (`prompt_pure_async_git_arrows`) and
is also called within `prompt_pure_async_git_fetch` to return the arrow
status immediately after `git fetch` has completed, this saves us from
waiting until the git fetch is done to only then execute a new async
job to check the arrow status.

Changes in git arrow / git dirty status are also handled better and
`prompt_pure_preprompt_render` is not called unless they actually
changed.

2017-01-19 17:30:19 +02:00

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