Add toggle to set default output mode of all cells to being fully expanded rather than scrollable

[shergreen]

Note that this feature request is for notebook 7.x/retrolab.

[shergreen]

Sorry for tagging this as a bug, it happened automatically. This is a feature request.

[jtpio]

Maybe a setting in the settings editor would work?

If so this is likely where the logic would go:

notebook/packages/notebook-extension/src/index.ts

Lines 332 to 418 in 676a0fe

	/**
	* A plugin to enable scrolling for outputs by default.
	* Mimic the logic from the classic notebook, as found here:
	* https://github.com/jupyter/notebook/blob/a9a31c096eeffe1bff4e9164c6a0442e0e13cdb3/notebook/static/notebook/js/outputarea.js#L96-L120
	*/
	const scrollOutput: JupyterFrontEndPlugin<void> = {
	id: '@jupyter-notebook/notebook-extension:scroll-output',
	description: 'A plugin to enable scrolling for outputs by default.',
	autoStart: true,
	requires: [INotebookTracker],
	optional: [ISettingRegistry],
	activate: async (
	app: JupyterFrontEnd,
	tracker: INotebookTracker,
	settingRegistry: ISettingRegistry | null
	) => {
	const autoScrollThreshold = 100;
	let autoScrollOutputs = true;
	// decide whether to scroll the output of the cell based on some heuristics
	const autoScroll = (cell: CodeCell) => {
	if (!autoScrollOutputs) {
	// bail if disabled via the settings
	return;
	}
	const { outputArea } = cell;
	// respect cells with an explicit scrolled state
	const scrolled = cell.model.getMetadata('scrolled');
	if (scrolled !== undefined) {
	return;
	}
	const { node } = outputArea;
	const height = node.scrollHeight;
	const fontSize = parseFloat(node.style.fontSize.replace('px', ''));
	const lineHeight = (fontSize || 14) * 1.3;
	// do not set via cell.outputScrolled = true, as this would
	// otherwise synchronize the scrolled state to the notebook metadata
	const scroll = height > lineHeight * autoScrollThreshold;
	cell.toggleClass(SCROLLED_OUTPUTS_CLASS, scroll);
	};
	const handlers: { [id: string]: () => void } = {};
	const setAutoScroll = (cell: Cell) => {
	if (cell.model.type === 'code') {
	const codeCell = cell as CodeCell;
	const id = codeCell.model.id;
	autoScroll(codeCell);
	if (handlers[id]) {
	codeCell.outputArea.model.changed.disconnect(handlers[id]);
	}
	handlers[id] = () => autoScroll(codeCell);
	codeCell.outputArea.model.changed.connect(handlers[id]);
	}
	};
	tracker.widgetAdded.connect((sender, notebook) => {
	// when the notebook widget is created, process all the cells
	notebook.sessionContext.ready.then(() => {
	notebook.content.widgets.forEach(setAutoScroll);
	});
	notebook.model?.cells.changed.connect((sender, args) => {
	notebook.content.widgets.forEach(setAutoScroll);
	});
	});
	if (settingRegistry) {
	const loadSettings = settingRegistry.load(scrollOutput.id);
	const updateSettings = (settings: ISettingRegistry.ISettings): void => {
	autoScrollOutputs = settings.get('autoScrollOutputs')
	.composite as boolean;
	};
	Promise.all([loadSettings, app.restored])
	.then(([settings]) => {
	updateSettings(settings);
	settings.changed.connect((settings) => {
	updateSettings(settings);
	});
	})
	.catch((reason: Error) => {
	console.error(reason.message);
	});
	}
	},
	};

[jtpio]

Closing as fixed by #7511