A live ScrollFrame re-points its child's TOPLEFT to the frame's own TOPLEFT at
the scroll offsets, which the reference does by calling SetPoint on the child
(0x787100). This replaced the child's whole anchor list instead — and 1.12's
SetPoint merges a point into the list, it does not clear it.
The difference is not academic. AceGUI's scroll child is authored TOPLEFT *and*
TOPRIGHT to its parent with an explicit height and no width
(AceGUIContainer-ScrollFrame.lua:192-195), so the corner pair is where its width
comes from. Dropping TOPRIGHT left it with one corner and no width, so it
resolved to no rect at all — and with no rect for the child, nothing below it
resolved either.
That is what drew AI_VoiceOver's options window as chrome and tabs over an empty
content area. The whole widget tree was there the entire time: probed through
addon_harness, the panel builds TabGroup → ScrollFrame → four InlineGroups of
CheckBoxes, Dropdowns, Sliders and Buttons, every one sized and IsVisible() true
— and every one from the scroll child down answering GetLeft() == nil. After
this, the same probe reads the scroll child at L=190 T=563 and its first
checkbox at L=200 T=530 B=506, inside the viewport.
The override's edges now include the authored anchors' targets as well, since the
merge means the child reads both.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SgstFWtn1RxEJ5kVrpgYwn
gromandClaude Opus 5
75432f7dde