WIP: No active tab sometimes happens when dragging off or closing tabs

[bbondy]

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.

Test Plan:

Reviewer Checklist:

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 #10095 into master will decrease coverage by 0.59%.
The diff coverage is 28%.

@@            Coverage Diff            @@
##           master   #10095     +/-   ##
=========================================
- Coverage   52.95%   52.36%   -0.6%     
=========================================
  Files         228      228             
  Lines       20308    20324     +16     
  Branches     3254     3256      +2     
=========================================
- Hits        10754    10642    -112     
- Misses       9554     9682    +128

Flag	Coverage Δ
#unittest	52.36% <28%> (-0.6%)	⬇️

Impacted Files	Coverage Δ
js/actions/windowActions.js	5.66% <ø> (+0.05%)	⬆️
app/renderer/reducers/frameReducer.js	28.07% <ø> (-0.17%)	⬇️
js/actions/appActions.js	12.68% <ø> (-0.65%)	⬇️
js/constants/appConstants.js	100% <ø> (ø)	⬆️
js/stores/windowStore.js	30.71% <0%> (-0.18%)	⬇️
app/common/state/tabState.js	58.91% <0%> (-14.43%)	⬇️
app/browser/windows.js	17.24% <100%> (ø)	⬆️
app/sessionStore.js	68.2% <100%> (ø)	⬆️
app/browser/tabs.js	24.28% <14.92%> (-0.79%)	⬇️
app/browser/reducers/tabsReducer.js	45.22% <50%> (-4.95%)	⬇️
... and 6 more

[bbondy]

superseded