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fix: chat scroll fix

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SocksOnHead
2026-06-05 02:46:39 +02:00
parent 9e1d75d038
commit ca069e2f61
6 changed files with 203 additions and 209 deletions
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8
toju-app/src/app/domains/chat/README.md
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@@ -15,7 +15,7 @@ chat/
│ └── rules/
│ ├── message.rules.ts canEditMessage, normaliseDeletedMessage, getMessageTimestamp
│ ├── message-sync.rules.ts Inventory-based sync: chunkArray, findMissingIds, limits
│ └── auto-scroll.rules.ts resolveAutoScrollBehavior: instant on channel switch, smooth for live msgs
│ └── auto-scroll.rules.ts resolveAutoScrollBehavior (instant on channel switch, smooth for live msgs) + isStuckToBottom predicate
│
├── feature/
│ ├── chat-messages/ Main chat view (orchestrates composer, list, overlays)
@@ -148,6 +148,12 @@ graph LR
| `getLatestTimestamp(msgs)` | Max timestamp across a batch, used for sync ordering |
| `chunkArray(items, size)` | Splits arrays into fixed-size chunks for batched transfer |
| `findMissingIds(remote, local)` | Compares inventories and returns IDs to request |
| `resolveAutoScrollBehavior(input)` | Decides `instant` / `smooth` / `none` when the message count changes |
| `isStuckToBottom(distance, threshold?)` | True while the list is close enough to the bottom to keep auto-pinning (default 300px) |
## Auto-scroll
Opening a conversation must land on the newest message even though images, link/media embeds, and plugin-rendered content load asynchronously and change the list height after the first render. `MessageListComponent` keeps a `stickToBottom` flag (set on channel switch and whenever the user scrolls within `STICKY_BOTTOM_THRESHOLD` of the bottom) and observes the rendered message content with a `ResizeObserver`. While stuck, every content height change re-pins to the bottom — with no arbitrary timeout — so late-loading content can never leave the user mid-scroll. The flag clears as soon as the user scrolls up to read history, at which point a `New messages` indicator is shown instead. `resolveAutoScrollBehavior` chooses an instant jump during the post-switch settle window (and for the user's own sends) and a smooth animation for live messages afterwards.
## Typing indicator