In A Large Git Repository Chain Is Incredibly Slow To Interact With The Shell

[bonedaddy]

In a git repo of approximatley 1.9GB, using chain is nearly impossible. Any basic invocations (ie, cd, enter, ls) take ages to resolve and the shell appears hung. Contrast this to a regular fish shell, or a regular bash shell which works without issue.

Repro steps:

• install fish
• run git clone https://github.com/mozilla/DeepSpeech
• cd into DeepSpeech directory
• Press enter key or ls, or run any command and the shell hangs

After doing some testing, the issue appears to be related to this command:

There are still jobs active:

   PID  Command
455945  not command git diff --no-ext-diff --quiet --exit-code 2>/dev/null

This is also very problematic because it will slow down all current running fish shells