Fixes "Error on flush" shown in R2023a on Windows

fixes mathworks/jupyter-matlab-proxy#54

Author: rashedmyt

matlab_proxy/settings.py

@@ -294,15 +294,19 @@ def get_matlab_settings():
     )
     matlab_lic_mode = ["-licmode", "file"] if nlm_conn_str else ""
     # flag to hide MATLAB Window
-    flag_to_hide_desktop = "-noDisplayDesktop" if system.is_windows() else "-nodesktop"
+    flag_to_hide_desktop = (
+        ["-noDisplayDesktop", "-wait", "-log"]
+        if system.is_windows()
+        else ["-nodesktop"]
+    )
     matlab_startup_file = str(Path(__file__).resolve().parent / "matlab" / "startup.m")
     return {
         "matlab_path": matlab_root_path,
         "matlab_version": get_matlab_version(matlab_root_path),
         "matlab_cmd": [
             matlab_executable_path,
             "-nosplash",
-            flag_to_hide_desktop,
+            *flag_to_hide_desktop,
             "-softwareopengl",
             *matlab_lic_mode,
             "-r",

matlab_proxy/util/windows.py

@@ -1,4 +1,4 @@
-# Copyright 2022 The MathWorks, Inc.
+# Copyright 2022-2023 The MathWorks, Inc.
 import asyncio
 
 from matlab_proxy import util
@@ -49,6 +49,7 @@ async def start_matlab(matlab_cmd, matlab_env):
     intermediate_proc = await asyncio.create_subprocess_exec(
         *matlab_cmd,
         env=matlab_env,
+        stdout=asyncio.subprocess.PIPE,
         stderr=asyncio.subprocess.STDOUT,
     )