move intial opening of browser to server on startup event

as a band aid fix to handle race condition between starting server and opening of web browser

src/blenderbim/blenderbim/bim/data/webui/sioserver.py

@@ -1,5 +1,6 @@
 import sys
 import os
+import webbrowser
 
 blenderbim_path = os.environ.get("blenderbim_path")
 if blenderbim_path:
@@ -119,10 +120,15 @@ async def gantt(request):
     return web.Response(text=html_content, content_type="text/html")
 
 
+async def open_web_browser(app):
+    webbrowser.open(f"http://127.0.0.1:{sio_port}/")
+
+
 app.router.add_get("/", index)
 app.router.add_get("/gantt", gantt)
 app.router.add_static("/jsgantt/", path="../gantt", name="jsgantt")
 app.router.add_static("/static/", path="./static", name="static")
+app.on_startup.append(open_web_browser)
 
 
 def main():

src/blenderbim/blenderbim/tool/web.py

@@ -84,7 +84,10 @@ class Web(blenderbim.core.tool.Web):
         ws_process = subprocess.Popen(
             [sys.executable, ws_path, "--p", str(port), "--host", "127.0.0.1"], cwd=webui_path, env=env
         )
-        cls.open_web_browser(port)
+        # moved intial opening of web browser to server on startup event
+        # to handle race condition between starting server and openning browser
+        # TODO: a better way to handle race condition
+        # cls.open_web_browser(port)
         cls.set_is_running(True)
 
     @classmethod