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fix(call): send theme changes only once the call frame is ready (postMessage origin error) #478

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jared merged 1 commits from fix/call-theme-before-ready into lotus 2026-10-28 20:52:06 -04:00
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Lotus CIandClaude Opus 5.5 2612f71c57 fix(call): send theme changes only once the call frame is ready (postMessage origin error)
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Reported from the desktop app console on joining a call: "Failed to execute
postMessage on DOMWindow: The target origin provided (http://127.0.0.1:44548)
does not match the recipient window origin (http://localhost:44548)".

useCallThemeSync calls embed.setTheme as soon as the call view mounts. With
waitForIframeLoad: false that send goes out while the iframe is still on its
initial about:blank, which has the app origin, so the browser refuses the
message addressed to the call origin and the request hangs to a timeout. The
theme was right anyway (it is in the frame URL), so this was noise plus a
pending request.

setTheme now only records the theme until the widget API is ready; on ready
it sends the latest theme if it differs from the one the frame loaded with.

Reproduced with the app on localhost and the call frame on 127.0.0.1 (as on
desktop) against the local LiveKit stack: joining logged the error before,
none after.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5
 2026-10-28 20:29:53 -04:00