Waters ChurchandClaude Fable 5.1
c46f98818e
The Add-tile menu would stop appearing once enough tiles were on the dashboard — a different count each time. The button's handler awaited GET /api/modules before revealing the menu, and that request could never complete: browsers allow about six HTTP/1.1 connections per host, an open EventSource holds one for as long as it lives, and every stream-fed tile (ProPresenter, Timers, PCO Plan, ProdCom) opened its own. With the shell's own /api/events that is the whole allowance at five or six such tiles, and every request after that — the picker's module list, a new tile's /state, its stream — sat in the browser's queue for a connection that was never handed back. The count varied because a stream in its 3-second retry loop frees a connection for a moment, and a clock tile holds none. Reproduced with six stream-fed tiles: the sixth stream and the picker's /api/modules both pend forever, and the menu stays hidden after the click. Three changes, all in the shell: - Dropdowns open the moment they are clicked, from what the page already knows, and slot in what their rebuild fetches when it lands. A rebuild that fails leaves the previous contents rather than an invisible menu, and a generation token stops a late fetch from repainting a menu that has since been closed or reopened (the old await also let two quick clicks cancel each other out). The ＋ picker repaints only when the module list actually changed; the layout menu shows Save and Reset at once and inserts the server's layouts above Reset when they arrive. - Tiles asking for the same stream share one connection. moduleApi.sse() now subscribes to a shell-wide pool with one EventSource per URL, fanning events out to every subscriber and reconnecting on the same 3-second timer while anyone listens; a tile joining an open stream is told `open` straight away, so its backfill runs as before. Six tiles of three modules now hold three connections instead of six. Modules see no difference. - /api/modules and /api/layouts fetches give up after 8 s instead of pending forever, so nothing awaiting them can hang. Verified in the browser pane against a scratch server: the same six-tile layout now opens the picker instantly with all five modules listed and /api/modules completes; with the pool deliberately starved (three extra EventSources) the picker still opens from its cached list. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>