Every KiCad editor's File→Quit used to destroy the wx top frame and
notify nobody, leaving the SPA stranded on the editor URL with a dead
canvas. It now behaves like the browser Back button: return to wherever
the user entered the editor from (project page, or a previous editor).
- WasmTool installs window.wxAppTopWindowClosed (the wx wasm port fires it
from the main frame's destructor — see the wxwidgets pointer bump). On a
real quit it history.back()s when there is same-origin in-app history,
else location.assign()s the project page (or "/" for lib editors).
- The navigation is deferred one task (setTimeout 0): it fires inside the
C++ destructor via EM_ASM under Asyncify, and a cross-document
location.assign() started there is aborted by the continuing teardown;
only same-document history.back() survives synchronously.
- Latches off on pagehide (the port also closes the frame on page unload
via UnloadCallback) and reloads on a bfcache pageshow so Forward never
restores a dead frame.
- e2e: quit-to-project.spec.ts covers both the history-back and the
deep-link fallback paths.
No kicad changes — the whole hook lives in the wxWidgets wasm port and the
web app, keeping the kicad fork clean for upstream syncs.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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