update urlbar value on selection change

[bridiver]

fix #8865

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).

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

[bbondy]

There's still various navbar tests that are failing so not sure if this makes it worse or better for tests, but I verified it does fix the problem reported so merging.

[jonathansampson]

Nice work!