IgniteUI / igniteui-angular / 41211779053

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fix(grid): preserve row order after viewport resize (#17785)

* fix(grid): preserve row order after viewport resize

* fix(for-of): address copilot comment

* refactor(for-of): reuse scroll offset sync and share prepend logic

- Sync the offset after a container resize through _updateScrollOffset,
  after the scrollbar size is recalculated, and make it RTL aware.
- Extract the shared addLastElem logic into insertChunkElem with a
  createTemplateContext override for the grid directive.
- Add LTR/RTL tests for the offset after igxForOf changes.
- Add a changelog entry for #17575.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(for-of): use isRTL getter and make grow test fail before fix

- Use the isRTL getter in _updateScrollOffset instead of the scroll sign.
- Drop @hidden from the protected insertChunkElem.
- Grow the viewport without clamping the scroll position in the vertical
  test and assert the rows order and offset without re-scrolling.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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