Fusion - the Fusion 360 Bridge

@@ -107,9 +107,52 @@ def _find_fusion_launcher() -> Path | None:      if not candidates:         return None-    # Complete installs (has_ini) win; newest mtime breaks ties.-    candidates.sort(key=lambda c: (c[0], c[1]), reverse=True)-    return candidates[0][2]+    # Only a COMPLETE install (FusionLauncher.exe.ini present) counts as installed. A hash dir with+    # FusionLauncher.exe but NO .ini is a half-streamed/corrupt install - returning it made+    # detect_fusion() report installed:true mid-stream, so a fusion_start fired into it and hit+    # "Error Launching Streamed Application ... .ini is missing or incomplete" (fresh Hyper-V VM,+    # John, 2026-07-14). If nothing is complete, report NOT installed (readiness then surfaces the+    # streamer as installing).+    complete = [c for c in candidates if c[0]]+    if complete:+        complete.sort(key=lambda c: c[1], reverse=True)   # newest complete install wins+        return complete[0][2]+    return None+++_MIN_VALID_INI_BYTES = 512   # the truncated launcher .ini that broke the fresh VM was 412 bytes+++def _clean_incomplete_webdeploy() -> list:+    """Remove webdeploy production hash dirs that are INCOMPLETE: a FusionLauncher.exe present but its+    FusionLauncher.exe.ini missing or truncated (< _MIN_VALID_INI_BYTES). These are the residue of an+    interrupted stream that throws 'Error Launching Streamed Application'. Only ever called AFTER a+    launch failure (we already know something is corrupt), so aggressive cleanup is safe. Returns the+    dir names removed. Never raises."""+    import shutil+    removed = []+    for base in _WEBDEPLOY_BASES:+        if not base.exists():+            continue+        try:+            subdirs = [d for d in base.iterdir() if d.is_dir()]+        except OSError:+            continue+        for subdir in subdirs:+            if not (subdir / "FusionLauncher.exe").exists():+                continue+            ini = subdir / "FusionLauncher.exe.ini"+            try:+                ok = ini.exists() and ini.stat().st_size >= _MIN_VALID_INI_BYTES+            except OSError:+                ok = False+            if not ok:+                try:+                    shutil.rmtree(subdir, ignore_errors=True)+                    removed.append(subdir.name)+                except Exception:+                    pass+    return removed   def fusion_update_in_progress() -> bool:@@ -679,6 +722,34 @@ def ensure_fusion_running(fusion_info: dict, wait_addin: bool = False) -> dict |         if _has_fusion_process():             break     else:+        # LAUNCH FAILED - do NOT return a blind "process not found". READ the dialog that is almost+        # certainly on screen. The classic fresh-box cause is an INCOMPLETE stream: "Error Launching+        # Streamed Application ... FusionLauncher.exe.ini is missing or incomplete" (John, live on a+        # fresh Hyper-V VM 2026-07-14). Detect + dismiss it, CLEAN the corrupt webdeploy dir(s), and+        # tell the caller to re-stream - instead of silently sitting on a broken install.+        launch_err = None+        try:+            from handlers.dialog_classify import classify_launch_dialogs, close_dialog_bg+            for d in classify_launch_dialogs():+                if d.get("category") == "launch_error" or "streamed application" in (d.get("title") or "").lower():+                    launch_err = d+                    close_dialog_bg(d.get("hwnd"))+        except Exception:+            pass+        removed = _clean_incomplete_webdeploy()+        if launch_err or removed:+            return {+                "success": False,+                "error": "Fusion launch failed: INCOMPLETE streamed install (FusionLauncher.exe.ini "+                         "missing or truncated).",+                "errorCode": "fusion_incomplete_install",+                "cleanedWebdeployDirs": removed,+                "dialog": (launch_err or {}).get("title"),+                "_hint": "AUTO-RECOVERED: dismissed the launch-error dialog and removed the corrupt "+                         "webdeploy dir(s). Re-run fusion_install_fusion, then WAIT for fusion_readiness "+                         "to report installing:false (the streamer has exited) BEFORE fusion_start - "+                         "starting mid-stream is what corrupts the install.",+            }         return {             "success": False,             "error": "Fusion 360 launched but process not found after 30s",