Fix/add script message handler async - #4
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On macOS, AddScriptMessageHandler() injected its window.<name> alias into the current document via the synchronous RunScript() -> RunScriptSync(), which busy-waits with while(!done) wxYield() for evaluateJavaScript's completion handler. When the WKWebView is off-screen / in a background tab, macOS can throttle or suspend its WebContent process so the handler never fires, hanging the main thread. Add a runScriptSync parameter (default true, preserving behavior); when false the alias is injected asynchronously. GTK mirrors the flag; Edge ignores it (no sync RunScript). Co-authored-by: Cursor <cursoragent@cursor.com>
This was referenced Sep 10, 2026
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