Atom does not remember last-opened state if a spec window is closed last

[50Wliu]

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Reproduced the problem in Safe Mode: http://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
  • Followed all applicable steps in the debugging guide: http://flight-manual.atom.io/hacking-atom/sections/debugging/
  • Checked the FAQs on the message board for common solutions: https://discuss.atom.io/c/faq
  • Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aatom
  • Checked that there is not already an Atom package that provides the described functionality: https://atom.io/packages

Description

When a normal Atom window as well as an Atom spec window are open, closing the spec window last results in Atom attempting to save the state of the spec window rather than the actual project window. Spec windows should probably be ignored when saving state.

Steps to Reproduce

1. Open any project
2. Run specs using the GUI
3. Close the project window
4. Close the specs window
5. atom in terminal

Expected behavior: The project from step 1 to be reopened

Actual behavior: Atom appears un-maximized (same dimensions as the spec window) and with no project state.

Reproduces how often: 100%

Versions

Atom    : 1.23.0-dev-c30cc9bc8
Electron: 1.6.9
Chrome  : 56.0.2924.87
Node    : 7.4.0

Additional Information

This may be harder to reproduce on macOS due to its special Quit behavior.