Adds a base getAnchorRect on ChatMessageBubbleContentNode, the rich-bubble
override (including titleHeight in details recursion), bubble-item
forwarding to content nodes, ChatControllerInteraction.scrollToMessageIdWithAnchor,
and a scrollToAnchor that lands the anchor at the top of the content area /
its line. Threads anchor/scroll params through ChatController and related
call sites.
When a pinToEdgeWithInset item is taller than half of the visible
area (visibleSize.height - insets.top - insets.bottom), cap its
visible portion at halfArea. The remaining height extends past
visibleSize - insets.bottom into the bottom-inset region (occluded
by overlay UI like the chat input panel).
A new private helper `pinToEdgeBottomExtension(forPinnedHeight:)`
returns max(0, pinnedHeight - halfArea). Three sites consume it:
- calculatePinToEdgeTopInset caps the pinned item's contribution
to totalAboveAndPinned via `pinnedHeight - extension`.
- replayOperations isPinToEdgeTarget anchors the pinned item's
apparent maxY at visibleSize - insets.bottom + extension.
- isStrictlyScrolledToPinToEdgeItem matches the new anchor.
Both isPinToEdgeTarget and isStrictlyScrolledToPinToEdgeItem fire
when either calculatePinToEdgeTopInset() > 0 OR extension > 0, so
the cap also applies when items above the pinned item overflow
the visible area (in which case calculatePinToEdgeTopInset returns
0 but extension is still positive).
When the pinned item fits within halfArea, extension == 0 and
behavior is identical to before this change.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds an experimentalSnapScrollToPinnedItem path that resnaps scroll to
the first pinToEdgeWithInset item after inset/visible-size updates and
on empty itemNodes. Promotes ListViewItem to AnyObject and adds a
pinToEdgeWithInset protocol requirement with a default of false.
Also runs chat history transactions synchronously when updating scroll
around correlated messages, and tightens beganInteractiveDragging weak-
self handling.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Introduces a pin-to-edge mode for list items: items whose
pinToEdgeWithInset flag is true are pinned to the bottom edge of the
visible area, with the list geometry (pin inset, scrollToItem,
inset-transition offsetFix, visible-size updates) adjusted to handle
this new mode consistently.
Collected from spec, plan, and 12 iterative fixes during
implementation that refined pin-inset helpers, scroll landings, and
transition math. Pin-inset computation uses frame.size.height;
scrollToItem lands on the item's pinned position via apparentBounds.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
