Bug: Various JupyterLab UI bugs

[chuckbelisle]

Stan Hatko wrote:

A few days ago some strange glitches I have not seen in a long time started occurring again on AAW JupyterLab, in particular some keyboard shortcuts like ctrl+D stopped working (adds browser shortcut instead of deleting line) and sometimes text in a terminal suddenly disappears (entire terminal goes black except for the cursor) for a few seconds before suddenly reappearing. These bugs do not affect the stability of servers but are still very annoying. (edited)

[StanHatko]

Today I don't see the text in terminal disappearing bug (though I saw it all the time late last week), but the keyboard shortcuts issue remains. I think it affects all JupyterLab notebook servers.

A specific server affected is in the greenhouse-detection namespace, server process-sentinel.

[bryanpaget]

Unfortunately, this seems to be a feature of JupyterLab 4.0.x.

• CTRL+D delete string shortcut removed in jupyter 4.0.0 jupyterlab/jupyterlab#14548

I searched for a way of customizing keyboard shortcuts in JupyterLab and all I could find was:

• https://superuser.com/questions/1788897/make-controld-delete-the-current-line-in-jupyter-lab

I also reached out to CodeMirror but they were not interested in changing anything. I guess they are trying to be more consistent with VS Code:

• Ctrl D in JupyterLab 4.0.x codemirror/dev#1333

[mathis-marcotte]

Reposting message from Stan Hatko:

The AAW bug with the terminal screen text disappearing and reappearing has restarted today. Here is an example screenshot (this notebook server started with a light theme except the usual dark theme, not sure why, but I don't think that had an impact as other notebook servers with the dark theme have the same issue). You can see the cursor at the bottom, a few seconds later the text reappeared on the screen.

It doesn't seem to affect the stability of things running on the server, but it's still very annoying and distracting for text in terminals to suddenly vanish for a few seconds.

[chuckbelisle]

Placing back in backlog until Upstream fixed is provided.

[bryanpaget]

I've put the terminal text dissapearing issue into a separate issue:

• Investigate Disappearing Text in JupyterLab Terminals aaw-kubeflow-containers#588

[bryanpaget]

Placing back in backlog until Upstream fixed is provided.

I'm watching jupyterlab/jupyterlab#14548.

[StanHatko]

On new notebook servers ctrl+S and ctrl+F trigger browser actions in addition to the JupyterLab actions. As a workaround entering the following into the web developer console (in Edge) worked for me, disabling the browser action while keeping the Jupyter action. Code below from https://stackoverflow.com/questions/4446987/overriding-controls-save-functionality-in-browser and https://stackoverflow.com/questions/7091538/is-it-possible-to-disable-ctrl-f-of-find-in-page.

document.addEventListener("keydown", function(e) {
  if (e.keyCode === 83 && (navigator.platform.match("Mac") ? e.metaKey : e.ctrlKey)) {
    e.preventDefault();
    // Process event...
  }
}, false);

window.addEventListener("keydown",function (e) {
    if (e.keyCode === 114 || (e.ctrlKey && e.keyCode === 70)) { 
        e.preventDefault();
    }
})