Warning message when restarting Kernel

[Juan-132]

Select 'Kernel'
Choose either:

• Restart Kernel ...
• Restart Kernel and Clear Outputs ...
• Restart Kernel and Run All Cells ...

Result:

Expected result:
Do not show the warning message.

I find that restarting the Kernel (and rerunning all code), is a frequent action when working with a notebook. After iterating back and forth, you want to restart with a clean slate once in a while.

As it's a frequent and common action, it believe this does not really require a warning message.
Furthermore, restarting the Kernel is not a destructive action. All code is preserved, and can be recreated by a simple rerun.
There is also the 'checkpoints' feature, if you want to revisit older code and/or results.

Can this be disabled in settings? (i've not found any option so far)
How do others feel about disabling this message by default?

[jasongrout]

We've talked about following the common pattern of a checkbox that says "Don't show me this warning again" on such dialog boxes.

CC @tgeorgeux

[krassowski]

Of note, the dialogs now support chekboxes (https://jupyterlab.readthedocs.io/en/stable/extension/ui_helpers.html) and "Do not ask me again" is implemented for prompt for renaming file on save and closing files without saving:

jupyterlab/packages/docmanager-extension/src/index.tsx

Lines 905 to 942 in 82051a9

	const result = await InputDialog.getText({
	title: trans.__('Rename file'),
	okLabel: trans.__('Rename'),
	placeholder: trans.__('File name'),
	text: oldName,
	selectionRange: oldName.length - PathExt.extname(oldName).length,
	checkbox: {
	label: trans.__('Do not ask me again.'),
	caption: trans.__(
	'If checked, you will not be asked to rename future untitled files when saving them.'
	)
	}
	});
	if (result.button.accept) {
	newName = result.value ?? oldName;
	(widget as IDocumentWidget).isUntitled = false;
	if (typeof result.isChecked === 'boolean') {
	const currentSetting = (
	await settingRegistry.get(
	docManagerPluginId,
	'renameUntitledFileOnSave'
	)
	).composite as boolean;
	if (result.isChecked === currentSetting) {
	settingRegistry
	.set(
	docManagerPluginId,
	'renameUntitledFileOnSave',
	!result.isChecked
	)
	.catch(reason => {
	console.error(
	`Fail to set 'renameUntitledFileOnSave:\n${reason}`
	);
	});
	}
	}

jupyterlab/packages/docmanager/src/widgetmanager.ts

Lines 414 to 435 in 82051a9

	const confirm = await showDialog({
	title: trans.__('Confirmation'),
	body: trans.__('Please confirm you want to close "%1".', fileName),
	checkbox: isDirty
	? null
	: {
	label: trans.__('Do not ask me again.'),
	caption: trans.__(
	'If checked, no confirmation to close a document will be asked in the future.'
	)
	},
	buttons
	});
	if (confirm.isChecked) {
	this.confirmClosingDocument = false;
	}
	return Promise.resolve([
	confirm.button.accept,
	isDirty ? confirm.button.displayType === 'warn' : true
	]);

And kernel selection dialog has "Always start the preferred kernel":

jupyterlab/packages/apputils/src/sessioncontext.tsx

Lines 1350 to 1378 in 82051a9

	const hasCheckbox = typeof autoStartDefault === 'boolean';
	const dialog = new Dialog({
	title: trans.__('Select Kernel'),
	body: new Private.KernelSelector(sessionContext, this._translator),
	buttons,
	checkbox: hasCheckbox
	? {
	label: trans.__('Always start the preferred kernel'),
	caption: trans.__(
	'Remember my choice and always start the preferred kernel'
	),
	checked: autoStartDefault
	}
	: null
	});
	const result = await dialog.launch();
	if (sessionContext.isDisposed || !result.button.accept) {
	return;
	}
	if (hasCheckbox && result.isChecked !== null) {
	sessionContext.kernelPreference = {
	...sessionContext.kernelPreference,
	autoStartDefault: result.isChecked
	};
	}