Ensure a window with no frames is not the last remembered window to restore on next startup

[petemill]

Fix #13278

Also introduces a new flag --disable-buffer-window, e.g. npm start -- --disable-buffer-window which can be useful for comparing any issues.

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed. (Ask a Brave employee to help if you cannot access this document.)

Test Plan:

On #13278

Reviewer Checklist:

• Request a security/privacy review as needed if one was not already requested.

Tests

• Adequate test coverage exists to prevent regressions
• Tests should be independent and work correctly when run individually or as a suite ref
• New files have MPL2 license header

[codecov-io]

Codecov Report

Merging #13291 into master will decrease coverage by <.01%.
The diff coverage is 28.57%.

@@            Coverage Diff             @@
##           master   #13291      +/-   ##
==========================================
- Coverage   56.24%   56.23%   -0.01%     
==========================================
  Files         282      282              
  Lines       28221    28227       +6     
  Branches     4646     4648       +2     
==========================================
+ Hits        15873    15874       +1     
- Misses      12348    12353       +5

Flag	Coverage Δ
#unittest	56.23% <28.57%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
app/cmdLine.js	40% <100%> (+0.57%)	⬆️
app/sessionStoreShutdown.js	86.33% <100%> (ø)	⬆️
app/browser/windows.js	32.99% <9.09%> (-0.29%)	⬇️

[bsclifton]

Change works great (verified on Windows 7). Also verified --disable-buffer-window works as expected by using --debug-window-events 😄

Code change looks good too. Nice work 😄 👍

[bsclifton]

master 41294fc
0.23.x 96a7e06
0.22.x 2b04656