The setters go through `comp.settings`, which defaults to the Composition Settings dialog's
centre anchor, so `comp.width = 800` on a 400-wide comp shifted every unparented layer — and
all of its position keys — by 200 px. A script that resized a precomp then found its pixel
coordinates had moved under it.
After Effects' width and height setters only change the frame; moving the contents is what
"resize from centre" scripts do for themselves. The setters now pass `anchor: 0` (top left).
The dialog, which is where the anchor belongs, is untouched.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
