Fix stray space

[yucheng11122017]

What is the purpose of this pull request?

• Documentation update
• Bug fix
• Feature addition or enhancement
• Code maintenance
• DevOps
• Improve developer experience
• Others, please explain:

Overview of changes:
Resolve #2419, modified vue(modification made at minimal scope via trial and error) and add test;
Credit to @kaixin-hc for investigating the cause of the bug.

Anything you'd like to highlight/discuss:

Testing instructions:
Test with markbind serve -d

Proposed commit message: (wrap lines at 72 characters)
Fix stray space before popover and tooltip

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Checklist: ☑️

• Updated the documentation for feature additions and enhancements
• Added tests for bug fixes or features
• Linked all related issues
• No unrelated changes

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Reviewer checklist:

Indicate the SEMVER impact of the PR:

• Major (when you make incompatible API changes)
• Minor (when you add functionality in a backward compatible manner)
• Patch (when you make backward compatible bug fixes)

At the end of the review, please label the PR with the appropriate label: r.Major, r.Minor, r.Patch.

Breaking change release note preparation (if applicable):

• To be included in the release note for any feature that is made obsolete/breaking

Give a brief explanation note about:

• what was the old feature that was made obsolete
• any replacement feature (if any), and
• how the author should modify his website to migrate from the old feature to the replacement feature (if possible).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.50%. Comparing base (cab80b7) to head (cbe3ede).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2499      +/-   ##
==========================================
+ Coverage   51.11%   51.50%   +0.38%     
==========================================
  Files         124      124              
  Lines        5355     5398      +43     
  Branches     1152     1152              
==========================================
+ Hits         2737     2780      +43     
  Misses       2328     2328              
  Partials      290      290              

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[EltonGohJH]

LGTM