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fix(grid): Proccess trailing vertical scroll updates after throttling - 21.2.x - #17492

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fix(grid): Proccess trailing vertical scroll updates after throttling - 21.2.x#17492
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Closes #17484 #17432

Description

Motivation / Context

Type of Change (check all that apply):

  • Bug fix
  • New functionality
  • Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • Refactoring (no functional changes)
  • Documentation
  • Demos
  • CI/CD
  • Tests
  • Changelog
  • Skills/Agents

Component(s) / Area(s) Affected:

How Has This Been Tested?

  • Unit tests
  • Manual testing
  • Automated e2e tests

Test Configuration:

  • Angular version:
  • Browser(s):
  • OS:

Screenshots / Recordings

Checklist:

  • All relevant tags have been applied to this PR
  • This PR includes unit tests covering all the new code (test guidelines)
  • This PR includes API docs for newly added methods/properties (api docs guidelines)
  • This PR includes feature/README.MD updates for the feature docs
  • This PR includes general feature table updates in the root README.MD
  • This PR includes CHANGELOG.MD updates for newly added functionality
  • This PR contains breaking changes
  • This PR includes ng update migrations for the breaking changes (migrations guidelines)
  • This PR includes behavioral changes and the feature specification has been updated with them
  • Accessibility (ARIA, keyboard navigation, focus management) has been verified

@mddragnev mddragnev added ❌ status: awaiting-test PRs awaiting manual verification scroll labels Aug 7, 2026
Copilot AI review requested due to automatic review settings August 7, 2026 12:56

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Pull request overview

This PR adjusts the grid’s vertical scroll event throttling so that a “trailing” scroll update is processed after the throttle window, addressing scroll state desynchronization and empty-gap scenarios reported in #17484 and #17432.

Changes:

  • Enabled { leading: true, trailing: true } on the scrollNotify throttling pipeline to ensure the final scroll position is applied after throttling.

Comment thread projects/igniteui-angular/grids/grid/src/grid-base.directive.ts
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