Move last bits of window setup to platform code

This avoids glfwCreateWindow emitting GLFW_FEATURE_UNAVAILABLE or
GLFW_FEATURE_UNIMPLEMENTED on Wayland because shared code was calling
unimplemented or unavailable platform functions during final setup.

It also makes it consistent with the final setup of full screen windows.

src/cocoa_window.m

@@ -931,13 +931,31 @@ int _glfwCreateWindowCocoa(_GLFWwindow* window,
             if (!_glfwCreateContextOSMesa(window, ctxconfig, fbconfig))
                 return GLFW_FALSE;
         }
+
+        if (!_glfwRefreshContextAttribs(window, ctxconfig))
+            return GLFW_FALSE;
     }
 
+    if (wndconfig->mousePassthrough)
+        _glfwSetWindowMousePassthroughCocoa(window, GLFW_TRUE);
+
     if (window->monitor)
     {
         _glfwShowWindowCocoa(window);
         _glfwFocusWindowCocoa(window);
         acquireMonitor(window);
+
+        if (wndconfig->centerCursor)
+            _glfwCenterCursorInContentArea(window);
+    }
+    else
+    {
+        if (wndconfig->visible)
+        {
+            _glfwShowWindowCocoa(window);
+            if (wndconfig->focused)
+                _glfwFocusWindowCocoa(window);
+        }
     }
 
     return GLFW_TRUE;