Patch HoloViews client comm to ensure server comm is initialized (#6234)

CHANGELOG.md

@@ -34,7 +34,8 @@ This patch release focuses on a number of fixes and minor enhancements for the c
 - Fix pyodide loading message styling issues ([#6194](https://github.com/holoviz/panel/pull/6194))
 - More complete patch for the `TextEditor` to support being rendered in the Shadow DOM ([#6222](https://github.com/holoviz/panel/pull/6222))
 - Add guard to `Tabulator` ensuring that it does not error when it is not rendered ([#6223](https://github.com/holoviz/panel/pull/6223))
-- Fix race conditions when instantiating Comm in Jupyter causing notifications to break ([#6229](https://github.com/holoviz/panel/pull/6229))
+- Fix race conditions when instantiating Comm in Jupyter causing notifications to break ([#6229](https://github.com/holoviz/panel/pull/6229), [#6234](https://github.com/holoviz/panel/pull/6234))
+- Handle duplicate attempts at refreshing auth tokens ([#6233](https://github.com/holoviz/panel/pull/6233))
 
 ### Compatibility & Security
 

doc/about/releases.md

@@ -36,7 +36,8 @@ This patch release focuses on a number of fixes and minor enhancements for the c
 - Fix pyodide loading message styling issues ([#6194](https://github.com/holoviz/panel/pull/6194))
 - More complete patch for the `TextEditor` to support being rendered in the Shadow DOM ([#6222](https://github.com/holoviz/panel/pull/6222))
 - Add guard to `Tabulator` ensuring that it does not error when it is not rendered ([#6223](https://github.com/holoviz/panel/pull/6223))
-- Fix race conditions when instantiating Comm in Jupyter causing notifications to break ([#6229](https://github.com/holoviz/panel/pull/6229))
+- Fix race conditions when instantiating Comm in Jupyter causing notifications to break ([#6229](https://github.com/holoviz/panel/pull/6229), [#6234](https://github.com/holoviz/panel/pull/6234))
+- Handle duplicate attempts at refreshing auth tokens ([#6233](https://github.com/holoviz/panel/pull/6233))
 
 ### Compatibility & Security
 

panel/io/notebook.py

@@ -241,6 +241,13 @@ def render_mimebundle(
     Displays bokeh output inside a notebook using the PyViz display
     and comms machinery.
     """
+    # WARNING: Patches the client comm created by some external library
+    #          e.g. HoloViews, with an on_open handler that will initialize
+    #          the server comm.
+    if manager and manager.client_comm_id in _JupyterCommManager._comms:
+        client_comm = _JupyterCommManager._comms[manager.client_comm_id]
+        if not client_comm._on_open:
+            client_comm._on_open = lambda _: comm.init()
     if not isinstance(model, Model):
         raise ValueError('Can only render bokeh LayoutDOM models')
     add_to_doc(model, doc, True)