fix: reset UI selection on setter

[ph-fritsche]

What:

Reset our "UI" selection when the selection is programmatically changed.

Why:

Selection can be set programmatically per properties as well as per setSelectionRange.

Might help resolving #758

How:

Intercept selectionStart/selectionEnd setter.

Checklist:

• Tests
• Ready to be merged

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[codecov]

Codecov Report

Merging #770 (36241fe) into alpha (4f04a3d) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             alpha      #770   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           64        64           
  Lines         1304      1312    +8     
  Branches       505       505           
=========================================
+ Hits          1304      1312    +8     

Impacted Files	Coverage Δ
src/document/selection.ts	100.00% <100.00%> (ø)

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[github-actions]

🎉 This PR is included in version 14.0.0-alpha.5 🎉

The release is available on:

• npm package (@alpha dist-tag)
• GitHub release

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