HTML Book citation tooltip layout "flickering"

Description

Citation tooltip can get in a broken layout state where it "flickers".

https://user-images.githubusercontent.com/674792/231461610-0d07e4bd-dac0-40e4-8011-165b41b49c3b.mov

Steps to Reproduce:

• See the attached repo.zip
• quarto preview
• Maximize the screen
• Navigate to Preface
• Mouse over the citation Knuth [1984];

Expected Result

No layout change. Citation stays in current location with tooltip to reference.

Actual Result:

Cycling reflow flickering

Environment

Mac

❯ quarto check

[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.1.1: OK
      Dart Sass version 1.55.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 99.9.9
      Path: /Users/amanning/projects/github/quarto/quarto-cli/package/dist/bin

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.11.2
      Path: /Library/Frameworks/Python.framework/Versions/3.11/bin/python3
      Jupyter: 5.2.0
      Kernels: julia-1.8, julia-1.7, python3

[✓] Checking Jupyter engine render....OK

[✓] Checking R installation...........OK
      Version: 4.2.1
      Path: /Library/Frameworks/R.framework/Resources
      LibPaths:
        - /Library/Frameworks/R.framework/Versions/4.2/Resources/library
      knitr: 1.42
      rmarkdown: 2.20

[✓] Checking Knitr engine render......OK

Checklist

• Please include a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
• Please format your issue so it is easier for us to read the bug report.
• Please document the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
• Please document the operating system you're running. If on Linux, please provide the specific distribution.
• Please provide the output of quarto check so we know which version of quarto and its dependencies you're running.

Start with the attached repo.zip and reproduce the issue using quarto preview. Maximize the screen, navigate to Preface, and hover over Knuth [1984]; while observing the citation tooltip layout. Done means the citation remains in place and the tooltip no longer causes cycling reflow or flickering.