fix: send updates only when not rendering

[krissvaa]

React doesn't allow updates to state while rendering.
Reference

Fixes: #2643

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.35%. Comparing base (5d5a0fd) to head (7f66ef8).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2707   +/-   ##
=======================================
  Coverage   94.35%   94.35%           
=======================================
  Files          80       80           
  Lines        2551     2551           
  Branches      661      661           
=======================================
  Hits         2407     2407           
  Misses        140      140           
  Partials        4        4           

Flag	Coverage Δ
unittests	94.35% <ø> (ø)

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[taefi]

Overal, LGTM!
Just added one minor comment.

[sonarcloud]

Quality Gate failed

Failed conditions
26.2% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud

[vaadin-bot]

This ticket/PR has been released with Hilla 24.5.0.alpha15 and is also targeting the upcoming stable 24.5.0 version.