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fix(chat): stable code-block geometry, hydration reveal, deduped file stats

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Three first-render polish issues:

Code blocks jumped at end-of-stream: streaming defers the per-line
line-number markup, so the finished decorate pass inserted the gutter
column and shifted every code line right. The gutter's horizontal
footprint is now reserved with CSS while the markup is deferred, so the
final pass only fills in numbers and colors.

File references were verified twice per render and re-verified with the
wrong directory: the annotation pass's own DOM writes re-triggered its
MutationObserver, and the pass also ran before the effective directory
resolved — issuing stat probes under an empty directory and a second
time under the real one. The observer now ignores the pass's own
mutations and annotation waits for a resolved directory.

Content replacing the hydration skeleton popped in: it now plays a
one-shot 180ms fade (reduced-motion aware); cached session switches
never carry the class and stay instant. Also removed the dead
disableStaging prop and its unused pendingRevealWork threading.

Verified on a production build over CDP: a streamed code block's text
keeps its exact x-position across end-of-stream, and stat probes for a
message with file mentions are unique per path with the directory header
always present. The hydration fade path could not be exercised in the
harness (the live event stream pre-populates parts in a single-project
environment) and needs an eyeball check on a cold multi-project open.
This commit is contained in:
Bohdan Triapitsyn
2026-08-25 17:51:43 +03:00
parent 8c102cddd0
commit b946fc7083
5 changed files with 94 additions and 9 deletions
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packages/ui/src/index.css
+30
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@@ -1356,6 +1356,36 @@ html:not(.dark) .chat-scroll {
min-width: 100%;
}
/* First uncached open of a session shows a hydration skeleton; the real
timeline replacing it fades in once instead of popping. Cached session
switches never carry this class and stay instant. */
@keyframes oc-chat-hydration-reveal {
from {
opacity: 0;
}
to {
opacity: 1;
}
}
.oc-chat-hydration-reveal {
animation: oc-chat-hydration-reveal 180ms ease-out both;
}
@media (prefers-reduced-motion: reduce) {
.oc-chat-hydration-reveal {
animation: none;
}
}
/* While streaming defers the per-line gutter markup, hold its horizontal
footprint (2rem column + 0.75rem gap) so the finished pass only fills in
the numbers instead of shifting every code line. */
.markdown-content pre[data-md-gutter-reserved] > code {
display: block;
padding-left: 2.75rem;
}
.markdown-content [data-md-code-line-number] {
align-self: stretch;
padding-right: 0.75rem;