append when stream outputs are concatenated

Author: amunger

extensions/notebook-renderers/src/index.ts

@@ -282,12 +282,17 @@ function renderStream(outputInfo: OutputWithAppend, outputElement: HTMLElement,
 	const previousOutputParent = getPreviousMatchingContentGroup(outputElement);
 	// If the previous output item for the same cell was also a stream, append this output to the previous
 	if (previousOutputParent) {
-		const newContent = createContent(outputInfo, ctx, outputScrolling, error);
 		const existingContent = previousOutputParent.querySelector(`[output-item-id="${outputInfo.id}"]`) as HTMLElement | null;
 		if (existingContent) {
-			existingContent.replaceWith(newContent);
-
+			if (appendedText && outputScrolling) {
+				appendScrollableOutput(existingContent, outputInfo.id, appendedText, outputInfo.text(), false);
+			}
+			else {
+				const newContent = createContent(outputInfo, ctx, outputScrolling, error);
+				existingContent.replaceWith(newContent);
+			}
 		} else {
+			const newContent = createContent(outputInfo, ctx, outputScrolling, error);
 			previousOutputParent.appendChild(newContent);
 		}
 		previousOutputParent.classList.toggle('scrollbar-visible', previousOutputParent.scrollHeight > previousOutputParent.clientHeight);

extensions/notebook-renderers/src/textHelper.ts

@@ -128,7 +128,7 @@ export function appendScrollableOutput(element: HTMLElement, id: string, appende
 		outputLengths[id] = Math.min(fullBuffer.length, softScrollableLineLimit);
 		const newElement = scrollableArrayOfString(id, fullBuffer.slice(-1 * softScrollableLineLimit), trustHtml);
 		newElement.setAttribute('output-item-id', id);
-		element.replaceWith();
+		element.replaceWith(newElement);
 	}
 	else {
 		element.appendChild(handleANSIOutput(buffer.join('\n'), trustHtml));