src/vs/workbench/contrib/notebook/common/notebookOptions.ts/NotebookOptions/computeCodeCellEditorWidth
class NotebookOptions:	computeCodeCellEditorWidth(outerWidth: number): number {
		return outerWidth - (
			this._layoutConfiguration.codeCellLeftMargin
			+ this._layoutConfiguration.cellRunGutter
			+ this._layoutConfiguration.cellRightMargin
		);
	}