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Vance Ingalls
578d6202b4
Reported as "template variables are broken": binding an element's field to a variable via the flat inspector's "◇ var" promote chip (or editing an already-bound field's value) wrote the correct bytes to disk, but the Variables tab kept showing the pre-edit value until the whole Studio page was hard-reloaded. Root cause: DesignPanelPromoteProvider deliberately opens its OWN SDK session (`useSdkSession(projectId, selection.sourceFile ?? activeCompPath)`) so that promoting inside a sub-composition binds the variable in the sub-comp's own file, not the host's. For the common case — a top-level element, same file as `activeCompPath` — this session is a SEPARATE in-memory `Composition` instance from the shared one `VariablesPanel` (Variables tab, Slideshow, etc.) reads. A persist through the promote provider's session never fires the shared session's own "change" event. Worse, the shared session's file-change listener runs `isSelfWriteEcho(path, content)` to decide whether to reload — but `sdkSelfWriteRegistry` is keyed by file path only, not by session instance (its own doc comment assumes "the studio process has a single SDK session lifecycle at a time"). It sees the promote provider's write registered under the same path and concludes it's its own echo, permanently suppressing the reload it actually needs. Threaded `forceReloadSdkSession` (the same mechanism every other server-side-write path in Studio already uses for exactly this "resync after a write I didn't make myself" case) from App.tsx through StudioRightPanel into DesignPanelPromoteProvider, and call it after every successful promote/setDefault persist — unconditionally, not gated on the promote target matching activeCompPath, since re-opening a file that didn't change is a harmless no-op re-parse and a path-equality guard here already produced one subtly wrong comparison (activeCompPath can be null while the shared session still defaults to "index.html") before landing on this simpler version. Verified live: editing a variable-bound field's value now updates the Variables tab immediately, no reload required. App.tsx crossed the 600-line file-size gate after threading the new prop; extracted the tiny handleAddAssetAtPlayhead wrapper into its own useAddAssetAtPlayhead hook (with a regression test) to bring it back under. Full studio suite (2639 tests) green against a fresh main; typecheck/ oxlint/oxfmt clean.