fix: improve web runtime resolution and restore x11vnc ncache

universal-runtime/manager.py

@@ -71,15 +71,35 @@ def _sanitize_resolution(width: int | None, height: int | None) -> tuple[int, in
 def apply_resolution(width: int | None, height: int | None) -> tuple[int, int]:
     safe_w, safe_h = _sanitize_resolution(width, height)
     # Best effort: Xvfb usually exposes RandR and accepts xrandr -s.
+    applied = False
     try:
-        subprocess.run(  # noqa: S603
+        result = subprocess.run(  # noqa: S603
             ["xrandr", "-display", DISPLAY, "-s", f"{safe_w}x{safe_h}"],
             check=False,
             stdout=subprocess.DEVNULL,
             stderr=subprocess.DEVNULL,
         )
+        applied = result.returncode == 0
     except Exception:
-        pass
+        applied = False
+
+    if not applied:
+        # Fallback to default geometry if requested mode is unsupported.
+        try:
+            fallback_w, fallback_h = [int(x) for x in CHROME_WINDOW_SIZE.split(",", 1)]
+        except Exception:
+            fallback_w, fallback_h = 1920, 1080
+        safe_w, safe_h = _sanitize_resolution(fallback_w, fallback_h)
+        try:
+            subprocess.run(  # noqa: S603
+                ["xrandr", "-display", DISPLAY, "-s", f"{safe_w}x{safe_h}"],
+                check=False,
+                stdout=subprocess.DEVNULL,
+                stderr=subprocess.DEVNULL,
+            )
+        except Exception:
+            pass
+
     _state["resolution"] = f"{safe_w},{safe_h}"
     return safe_w, safe_h