extensions/markdown-language-features/src/commands/showPreview.ts/ShowPreviewCommand/execute
class ShowPreviewCommand:	public execute(mainUri?: vscode.Uri, allUris?: vscode.Uri[], previewSettings?: DynamicPreviewSettings) {
		for (const uri of Array.isArray(allUris) ? allUris : [mainUri]) {
			showPreview(this.webviewManager, this.telemetryReporter, uri, {
				sideBySide: false,
				locked: previewSettings && previewSettings.locked
			});
		}
	}