100% usage as Nuclide spawns HG diffs

Issue and Steps to Reproduce

When I open atom, with nuclide, to work on a local copy of http://hg.mozilla.org/integration/mozilla-inbound/ after about 10 seconds my fans start going and when I look at processes running I have a number of processes calling HG commands for diffs.

e.g.

USER              PID  %CPU %MEM      VSZ    RSS   TT  STAT STARTED      TIME COMMAND
dburns          36643  39.8  0.4  2543984  75464   ??  R     8:23PM   0:00.34 /usr/bin/python /usr/local/bin/hg diff --unifie
dburns          36640  39.5  0.4  2543216  74568   ??  R     8:23PM   0:00.33 /usr/bin/python /usr/local/bin/hg diff --unifie
dburns          36635  38.6  0.5  2548108  80972   ??  R     8:23PM   0:00.55 /usr/bin/python /usr/local/bin/hg diff --unifie
dburns          36647  37.5  0.1  2472516  15184   ??  R     8:23PM   0:00.14 /usr/bin/python /usr/local/bin/hg diff --unifie
dburns          36648  35.1  0.1  2472772  15328   ??  R     8:23PM   0:00.14 /usr/bin/python /usr/local/bin/hg diff --unifie

If I disable Nuclide and restart atom against the same repo this no longer happens. I am not sure if this is related to #457 or a regression that might have similar root cause as #84.

Expected Behavior

Not eat all my CPU causing my fans to roar at me

Actual Behavior

It was just spawning hg processes for diffs for some reason

Versions

Atom: 1.7.3
Nuclide: 0.134.0
Client OS: OSX 10.11.4
Server OS (optional):
Additional Details
Installed packages (apm ls --installed): dburns in ~/development/mozilla-central λ apm ls --installed Community Packages (19) /Users/dburns/.atom/packages ├── Sublime-Style-Column-Selection@1.5.1 ├── activate-power-mode@0.4.1 ├── base16-ocean-dark-syntax-theme@0.1.9 ├── base16-syntax@1.7.0 ├── build@0.60.0 ├── dash@1.6.0 ├── file-icons@1.7.8 ├── language-rust@0.4.6 ├── linter@1.11.4 ├── linter-eslint@7.2.1 ├── linter-pyflakes@0.3.0 ├── linter-rust@0.4.5 ├── material@2.2.0 ├── material-design-syntax@1.7.0 ├── minimap@4.23.2 ├── nuclide@0.134.0 ├── todo-show@1.5.0 ├── travis-ci-status@1.0.0 └── vim-mode@0.65.0

└── (empty)

facebookarchive / nuclide