Latest version break IPyWidgets

[DonJayamanne]

IPyKernel Version: 6.18.3
Install Jupyter and ipywidgets
Run a notebook with the following code

• Cell 1

from ipywidgets import FloatSlider, IntSlider, Image, IntText, link

slider = IntSlider(description="Continuous Slider", continuous_update=True)
textbox = IntText(description="Continuous Text", continuous_update=True)

link((slider, 'value'), (textbox, 'value'))

• Cell 2

slider

• Cell 3

textbox

Drag the slider and the value in the textbox should change

Now: Install ipykernel==6.17.1 (previous version)
Test the same code and the value in the textbox will end up getting updated.

[blink1073]

Yanked. @martinRenou I'm inclined to completely back out these comm changes, I don't know how we can do this in a backward-compatible way.

[DonJayamanne]

thanks for addressing this quickly

Since that version has been pull out, please feel free to close this issue.
I'd close it, though I'm unsure whether you'd use this to track some breakage in that version/main branch before pushing the next version

[blink1073]

Thanks @DonJayamanne, let's leave this open for discussion.

[maartenbreddels]

Let me take a look if I can add a test case that covers this, @blink1073 you didn't expose this in the test of #1048 yet right?