First quick check if lastEmittedState and appState are different

[NejcZdovc]

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.

Resolves #10195

Auditors: @bridiver @bbondy

Test Plan:

• open two windows
• add bookmark in one
• bookmark should appear in both bookmark toolbars

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 #10498 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master   #10498   +/-   ##
=======================================
  Coverage   54.31%   54.31%           
=======================================
  Files         245      245           
  Lines       21148    21148           
  Branches     3259     3259           
=======================================
  Hits        11486    11486           
  Misses       9662     9662

Flag	Coverage Δ
#unittest	54.31% <0%> (ø)	⬆️

Impacted Files	Coverage Δ
js/stores/appStore.js	12.45% <0%> (ø)	⬆️