Unable to show plots from bqplot

[prasunanand]

Reported in #100

import numpy as np, bqplot.pyplot as plt
x = np.linspace(0, 1, 11)
y = x**2

fig = plt.figure()
plt.plot(x, y, figure=fig)
fig # or plt.show()

Output is

Figure(axes=[Axis(scale=LinearScale()), Axis(orientation='vertical', scale=LinearScale())], fig_margin={'top':…

Need to support msg_types

1. comm_open

{
  "header": {
    "msg_id": "b66a9da1-41bffe35c2e3491da9b437be_3066_6",
    "msg_type": "comm_open",
    "username": "prasunanand",
    "session": "b66a9da1-41bffe35c2e3491da9b437be",
    "date": "2025-08-10T06:54:39.680498Z",
    "version": "5.3"
  },
  "parent_header": {
    "msg_id": "868f14cd-3ffe-4b94-ac5c-b59d6bf4a525",
    "msg_type": "execute_request",
    "username": "prasunanand",
    "session": "cc339e32-a7f4-495a-a34d-9fe3495f7c64",
    "date": "2025-08-10T06:54:39.416000Z",
    "version": "5.2"
  },
  "msg_id": "",
  "msg_type": "",
  "content": {
    "comm_id": "70fa9522a58d43a6815a338216224096",
    "data": {
      "buffer_paths": [],
      "state": {
        "_model_module": "@jupyter-widgets/base",
        "_model_module_version": "2.0.0",
        "_model_name": "LayoutModel",
        "_view_count": null,
        "_view_module": "@jupyter-widgets/base",
        "_view_module_version": "2.0.0",
        "_view_name": "LayoutView",
        "align_content": null,
        "align_items": null,
        "align_self": null,
        "border_bottom": null,
        "border_left": null,
        "border_right": null,
        "border_top": null,
        "bottom": null,
        "display": null,
        "flex": null,
        "flex_flow": null,
        "grid_area": null,
        "grid_auto_columns": null,
        "grid_auto_flow": null,
        "grid_auto_rows": null,
        "grid_column": null,
        "grid_gap": null,
        "grid_row": null,
        "grid_template_areas": null,
        "grid_template_columns": null,
        "grid_template_rows": null,
        "height": null,
        "justify_content": null,
        "justify_items": null,
        "left": null,
        "margin": null,
        "max_height": null,
        "max_width": null,
        "min_height": null,
        "min_width": null,
        "object_fit": null,
        "object_position": null,
        "order": null,
        "overflow": null,
        "padding": null,
        "right": null,
        "top": null,
        "visibility": null,
        "width": null
      }
    },
    "target_module": null,
    "target_name": "jupyter.widget"
  },
  "buffers": null,
  "metadata": {
    "version": "2.1.0"
  },
  "tracker": 0,
  "error": null,
  "channel": "iopub"
}

2. comm_msg

{
  "header": {
    "msg_id": "b66a9da1-41bffe35c2e3491da9b437be_3066_13",
    "msg_type": "comm_msg",
    "username": "prasunanand",
    "session": "b66a9da1-41bffe35c2e3491da9b437be",
    "date": "2025-08-10T06:54:39.681694Z",
    "version": "5.3"
  },
  "parent_header": {
    "msg_id": "868f14cd-3ffe-4b94-ac5c-b59d6bf4a525",
    "msg_type": "execute_request",
    "username": "prasunanand",
    "session": "cc339e32-a7f4-495a-a34d-9fe3495f7c64",
    "date": "2025-08-10T06:54:39.416000Z",
    "version": "5.2"
  },
  "msg_id": "",
  "msg_type": "",
  "content": {
    "comm_id": "0be3639b5d744638b9a5ebb8817b12d9",
    "data": {
      "buffer_paths": [],
      "method": "update",
      "state": {
        "marks": [
          "IPY_MODEL_2bdcf3abfe474882b70ba08fe7ddc5c4"
        ]
      }
    }
  },
  "buffers": null,
  "metadata": {},
  "tracker": 0,
  "error": null,
  "channel": "iopub"
}