Commits on Mar 7, 2021

1. Make help and fish_config work on Chrome OS …

   When `fish` is running in the Chrome OS Linux VM (Crostini),
   both `help` and `fish_config` opened a "file not found"
   page. That is because on Crostini, `BROWSER` is usually set to
   `garcon-url-handler`, which opens URLs in the host OS Chrome
   browser. That browser lacks access to the Linux file system.
   
   This commit fixes these commands. `help` now opens the URL on
   www.fishshell.com.  `fish_config` now opens the URL for the
   server it starts. Previously, it opened a local file that
   redirects to the same URL.
   
   In the case of `help`, the situation could be improved further
   by starting a web server to serve help. I don't know of another
   way to access `/share/fish` from outside the VM without user
   intervention, and I think that might be a part of the security
   model for the Crostini VM.
   
   It's hard to write a test for this. I checked that `help math`,
   `python2 webconfig.py`, and `python3 webconfig.py` work on my
   machine running in Crostini.

   

   ilyagr committed Mar 7, 2021
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2. Incorporate black suggestions & rearrange imports slightly …

   This isn't really necessary, but it makes the file look nicer to
   my eyes. Let me know if you want me to remove this commit.

   

   ilyagr committed Mar 7, 2021
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