Objective

To determine if DomAccess.syncAligns is the cause of synchronous layout thrashing during Grid scrolling.

Context

Investigation of #9204 revealed a "Forced Reflow" violation (37ms) during scrolling, while VDOM updates themselves were fast (~2-4ms).
Message volume analysis ruled out event flooding.
Code search revealed that DomAccess.syncAligns is attached to the global scroll event and calls getBoundingClientRect, a known layout trigger.

Task

1. Instrument DomAccess.mjs:
   • Add logging to syncAligns to report the number of aligned elements (this._aligns.size).
   • Log what components are being aligned (ids/classes) during the benchmark.
2. Run Benchmark: Execute the Desktop Grid Scroll benchmark.
3. Analyze:
   • If _aligns size > 0 during the test, this is the culprit.
   • Identify the component causing the alignment (e.g., Tooltip, Menu, SortZone).

Outcome

Confirmation of whether syncAligns is the layout thrasher, and identification of the offending component(s) to optimize.