[BUG] Cannot apply patch to [id] which is not in the document anymore

ALL software version info (bokeh, python, notebook, OS, browser, any other relevant packages)

bokeh 2.0.0 py37_0 python 3.7.7 hcf32534_0_cpython WSL Ubuntu 18.04 (hosted on win10 Firefox 75.0 (64-bit) running the app with command bokeh serve testapp.py --dev

Description of expected behavior and the observed behavior

in reply to https://github.com/bokeh/bokeh/issues/7738#issuecomment-605670765, I open this new issue:

On updating the layout, the errors

2020-05-01 10:43:42,474 Cannot apply patch to 1606 which is not in the document anymore
2020-05-01 10:43:42,475 Cannot apply patch to 1606 which is not in the document anymore
2020-05-01 10:43:42,477 Cannot apply patch to 1606 which is not in the document anymore
2020-05-01 10:43:42,478 Cannot apply patch to 1606 which is not in the document anymore

are thrown, where the timestamp and id number change accordingly. The Webapp however runs unaffected of these messages.

Complete, minimal, self-contained example code that reproduces the issue

import numpy as np
import bokeh.io as io
import bokeh.models as mod
import bokeh.layouts as bly
import datetime as dt
from bokeh.plotting import figure

# Set up plots
def MyPlots():
    # make 2 simple plots
    x = np.linspace(0, 15, 200)
    y = np.sin(x)
    plot1 = figure(plot_height=400, plot_width=400, title=str(np.random.normal()))
    plot1.line(x, y,  line_width=3, line_alpha=0.6)

    plot2 = figure(plot_height=400, plot_width=400, title=str(np.random.normal()))
    plot2.line(x, y,  line_width=3, line_alpha=0.6)
    
    return [plot1,plot2]

p1,p2= MyPlots()

# make an input
buttons = mod.RadioButtonGroup( 
    labels=['One', 'Two'])

# callback
def update(attr, old, new):
    pl1,pl2=MyPlots()
    rev.children[0] = pl1
    rev.children[2] = pl2

buttons.on_change('active', update)

# Set up layouts and add to document
rev=bly.column(p1, buttons, p2)
io.curdoc().add_root(rev)

Stack traceback and/or browser JavaScript console output

no error traceback

Screenshots or screencasts of the bug in action

[bryevdv]

@bokeh/dev I propose we simply lower this from log.warning to log.debug (or even log.trace) with a slightly tweaked message. AFAICT there is basically only one situation that triggers this message, and in that situation ignoring any late changes for the already-removed models is just the correct thing to do, there is no reason to announce it.

[bryevdv]

It’s a log message, not a warning call. You’ll have to grab the logger and configure that (I don’t know the details)