Clicking "Merged Response" in a multi-model chat often made the merging model answer with "It appears that the responses provided from the other models were empty".
The merge handler collected each model's answer via `history.messages[id].content`. Assistant messages are persisted by the backend with `output` only (`upsert_message_to_chat_by_id_and_message_id` writes `done`/`role`/`output`, never `content`), so `content` is only populated in the browser session that generated the responses, where the streaming handler mirrors it. Once the chat is reloaded from the database, every assistant message has `content: ''` and the merge request is sent with a list of empty strings, which is exactly what the merging model then reports. That is why the failure looks random: merging works right after generating, and fails after a refresh or when reopening the chat.
Read the responses through `getOutputText(message.output) || message.content`, the same fallback already used by every other read site (`ResponseMessage`, `Overview/Node`, `SearchModal`, `ChatItem`, `ChatMenu`, `Navbar/Menu`).
Fixes#26962
Only the frontend added `stream_options: {include_usage: true}` to the completion payload, gated on the model's `usage` capability. Every backend-initiated run builds its own payload (automations, timers, subagents, channels) and omitted it, so those responses came back without token counts and never rendered the usage block, even with the capability enabled on the model.
Set it in `chat_completion` instead, the single handler all of those callers go through, and drop the two duplicate copies (the Anthropic-compat handler and the frontend). Capabilities are read from the resolved model before the custom-model fallback can rebind it, and the flag is applied after the model's `stream_response` override so a non-streaming model is unaffected.
Fixes#27653
Every action button on a response message gates its visibility on
'isLastMessage || ($settings?.highContrastMode ?? false)' so that buttons
stay visible (not hover-only) when High Contrast mode is on. The two
Regenerate buttons — the one inside RegenerateMenu and the fallback in the
{:else} branch — were missed and still gated on isLastMessage alone, so on
any non-last message the Regenerate icon was invisible until mouse-over even
with High Contrast enabled (#27638).
Add the same highContrastMode clause to both buttons, matching the other
action buttons in this file.
The "expand input" button was positioned with `fixed top-0 right-0`. That only kept it near the composer by accident: `#message-input-container` sets `backdrop-blur-sm`, and a backdrop-filter makes an element the containing block for fixed descendants, so the button resolved to the top-right corner of the entire composer instead of the text area it belongs to.
That corner is already taken. The `@`-tagged model chip renders as the first row of the same container with its dismiss button at the right end, so with a multi-line prompt and a tagged model the two controls are drawn on top of each other. The attached-files row has the same problem: the button paints over the first thumbnail and its remove button.
Anchor the button to the wrapper that holds the text area instead, using `relative`/`absolute`, so it always sits at the top-right of the input row and below whatever rows precede it. With no chip and no files the position is unchanged. As a side effect the button is no longer a child of the `overflow-auto` scroller, so it can no longer be clipped or scrolled out of view on long prompts.
Fixes#26736
The chat delete endpoints gate on chat.delete for non-admins, but none of
the UI affordances that reach them were conditioned on it, so a user
without the permission is offered controls that always fail with
"Access prohibited".
Gates every entry point on the same condition the backend enforces,
matching the existing chat.share / chat.export / chat.import gates in the
same components:
- Sidebar chat menu (ChatMenu) Delete item — also covers the Search
modal's menu, which reuses ChatMenu
- Sidebar Shift+hover inline Delete button (ChatItem)
- Sidebar hidden #delete-chat-button keyboard-shortcut target (ChatItem)
- Chat navbar menu Delete item (Navbar/Menu)
- Search modal Shift-held inline Delete button (SearchModal)
- Settings -> Data Controls -> Delete All Chats
- Settings -> Archived Chats per-row Delete
A message referencing a file that no longer exists rendered a broken
image, because nothing anywhere noticed the failed load. What the user saw
depended on the caller's alt text: in a response the alt is the message
content, so the entire reply was rendered inside the image frame, and the
preview still opened full-screen on a dead image.
Image.svelte now tracks a failed load and renders an 'Image unavailable'
placeholder instead, suppressing the preview for a source that cannot be
shown. The failed state resets when the source changes, so a replaced or
corrected URL is retried. An onError callback lets a caller react without
changing behaviour for the eight existing call sites, which are untouched.
Responses now pass the file name (or 'Generated Image') as alt rather than
the message content, which was never a description of the image.
A message sent while an attachment is still uploading is held in the chat
queue until the file settles. For files that release works, because the
message input calls onUpdate once the upload completes, which refreshes the
queued entry and asks the queue to run.
Attaching a URL takes a different path. uploadWeb sets the item to uploaded
but calls neither onUpdate nor processNextInQueue, and the queue is
otherwise only revisited when a generation finishes or when the chat is
mounted while idle. In a new chat with nothing generating, none of those
happen, so a message queued behind a URL waits with no event able to
release it until the chat is reloaded.
uploadWeb now asks the queue to run when it is done, the same way the file
path already does.
Newer OpenAI chat models put metadata on the opening line of a colon fence block, like :::writing{variant="email" id="48173" subject="Short question" recipient="mail@example.com"}. The tokenizer matched that line and discarded it, so every block rendered under the same generic "Writing" heading no matter what it contained.
The opening line is now parsed into an attributes map on the token and the header uses it: the subject becomes the title, the recipient follows it and the full string is reachable on hover when the row is too narrow for it. Blocks without metadata render exactly as before, and the other fence types get the parsed attributes for free.
Attributes are read only from inside the {...} braces, not from the whole opening line. Scanning the whole line turned ordinary prose containing key="value" into metadata, and it backtracked quadratically: a 40k character opening line took 586ms to parse, and that runs again on every re-lex while the message streams. Anchored to the braces it is 0.0ms.
Nothing here turns the recipient into a link or a send action. That metadata is model output and can be steered by whatever is in the context, so a prefilled mail action is a separate decision rather than a side effect of parsing.
KatexRenderer rendered the raw math source through {@html} whenever renderToString threw. throwOnError only suppresses KaTeX ParseError, so a RangeError (maximum call stack size exceeded, reachable with deeply-nested brace input) escaped into the catch and re-exposed the unescaped source. Because the math tokenizer captures everything between the delimiters verbatim, that source can carry an HTML/JS payload which then executed in the viewer's browser on the application origin, a stored, cross-user XSS reachable through normal chat/channel/shared-chat rendering. Escape the fallback so the source is shown as text and is never injected as HTML. Valid math is unaffected, it still renders through the success path.
Co-authored-by: maxntv <maxntv@users.noreply.github.com>
Timothy Jaeryang Baek