fix(chat): stabilize rehydration scroll-to-bottom convergence

Author: hannesrudolph

webview-ui/src/components/chat/ChatRow.tsx

@@ -143,11 +143,12 @@ const ChatRow = memo(
 		)
 
 		useEffect(() => {
+			const isHeightValid = height !== 0 && height !== Infinity
 			// used for partials, command output, etc.
 			// NOTE: it's important we don't distinguish between partial or complete here since our scroll effects in chatview need to handle height change during partial -> complete
 			const isInitialRender = prevHeightRef.current === 0 // prevents scrolling when new element is added since we already scroll for that
 			// height starts off at Infinity
-			if (isLast && height !== 0 && height !== Infinity && height !== prevHeightRef.current) {
+			if (isLast && isHeightValid && height !== prevHeightRef.current) {
 				if (!isInitialRender) {
 					onHeightChange(height > prevHeightRef.current)
 				}