src/vs/base/common/htmlContent.ts/MarkdownString/appendText
class MarkdownString:	appendText(value: string, newlineStyle: MarkdownStringTextNewlineStyle = MarkdownStringTextNewlineStyle.Paragraph): MarkdownString {
		this.value += escapeMarkdownSyntaxTokens(this.supportThemeIcons ? escapeIcons(value) : value)
			.replace(/([ \t]+)/g, (_match, g1) => '&nbsp;'.repeat(g1.length))
			.replace(/^>/gm, '\\>')
			.replace(/\n/g, newlineStyle === MarkdownStringTextNewlineStyle.Break ? '\\\n' : '\n\n');

		return this;
	}