Cursor stuck at multiple locations, some cells don't get focus when clicking, unable to edit cells.

[paul-callahan]

Describe the current behavior
Clicking on multiple cells results in the blinking cursor existing in multiple cells. None of the cells are editable. See attached screen video where the cursor is blinking in 3 cells at once.

Note this only happens on Chrome on Mac. Works as expected on Firefox.

Reproduce:

1. Go to this notebook.
2. Scroll down, single click a couple cells
3. Notice the blinking cursor "sticks" in multiple cells. See attached video.
4. Sometimes a cell won't even get focus when you click on it.
5. Attempting to edit any of the cells by clicking a cell and typing results in no edits happening.

Describe the expected behavior
The cursor is one cell at a time
Each unlocked cell is editable.

What web browser you are using
Chrome on Mac

Additional context
Seems the same as #4457 , #3425 , maybe also #1336
See attached video

Screen.Recording.2024-10-01.at.5.09.48.PM.mov

[katlyn-edwards]

Hrm, you're right, we have seen a few reports of this, but I can't get a solid repro - even with your linked notebook. If you can get this to happen again, can you help us debug more?

You mentioned Chrome on a Mac - can you include what version of Chrome, and what version of MacOS you're running?
If you can, open the Developer Console/Tools in Chrome, and see if there are any interesting Javascript exceptions occurring?

My current hypothesis, is that this notebook is not small (many cells), and a few of the cells are long text strings, so maybe we're having a hard time parsing? Is it only this notebook?

[paul-callahan]

Hrm, you're right, we have seen a few reports of this, but I can't get a solid repro - even with your linked notebook. If you can get this to happen again, can you help us debug more?

You mentioned Chrome on a Mac - can you include what version of Chrome, and what version of MacOS you're running? If you can, open the Developer Console/Tools in Chrome, and see if there are any interesting Javascript exceptions occurring?

My current hypothesis, is that this notebook is not small (many cells), and a few of the cells are long text strings, so maybe we're having a hard time parsing? Is it only this notebook?

Thanks for looking into this.

Chrome Version 124.0.6367.93 (Official Build) (arm64)
MacOS: 14.6.1 (23G93) ARM

No errors in the console, but I attached the log.

I created a small notebook with two cells the exhibits the behavior. Perhaps the unicode is causing the problem?

scroll up on this, for some reason I cannot link to the first cell:
https://colab.research.google.com/drive/1v2bepar6OFC03UxdJaSQnsjfdKZnhedQ#scrollTo=_paQxu7EOhvg

colab.research.google.com-1728051043198.log