* ui: land at the bottom of a conversation every time it opens
Opening a long conversation often stopped short of its end:
- the press grace counted from page load (pressedAt = 0), so a chat that
landed within 400 ms of a refresh did not follow the rows realizing
after the jump
- the click that opened a chat (sidebar row, tab) started the same grace,
so navigating by click had the same problem
- any scroll event away from the bottom stopped following, including the
ones the browser fires itself while the chat settles
- the chat screen outlives its routes, so going back to the last landed
conversation through the new-chat screen skipped the landing entirely
scrollToBottom() now clears the grace, only an upward scroll away from the
bottom stops following, and every navigation lands anew. Navigations into
a chat also disable SvelteKit's scroll reset, which moved the previous
conversation to its top for a few frames.
Where overflow-anchor is supported, a 1px pin after the messages is the
only scroll anchor while following, so the browser keeps the bottom in
place itself; WebKit keeps the resize observer.
Assisted-by: Claude (Opus 5.5 Medium)
* ui: let nested agentic content scrollers chain to the chat
Reasoning, shell output and code blocks used overscroll-behavior:
contain, so the wheel stopped dead at their edges instead of
scrolling the conversation.
Assisted-by: Claude (Opus 5.5 Medium)
* ui: stop following the stream as soon as the reader scrolls up
A trackpad or smooth wheel scrolls in steps smaller than the at-bottom
threshold, so each step up was re-stuck and snapped back on the next
growth while a response streamed. Any upward move that is not content
shrinking now releases at once.
The attach effect also read the hook's own state, so every flip
re-attached and re-measured, which undid such a release.
Assisted-by: Claude (Opus 5.5 Medium)
Aleksander Grygier
8ab29faec4