Function measureContentHeight

measureContentHeight(node: Node, options: { width: number }): number
Measure a node tree's intrinsic content height at the provided width.

This is a content-measurement helper, not a viewport/clipping helper. The caller-provided width is the authoritative wrapping width for the measured subtree. Measurement starts at the given node, ignores that node's own main-axis height constraints, and walks downward through its descendants. Descendant sizing rules still apply normally.

Use this for intrinsically sized content such as scrollback/message history chunks. If a wrapper's visible height is controlled by height, flex, or percentage sizing, measure the content subtree inside that wrapper instead.
Parameters
- node: Node
- options: { width: number }
Returns number
Example
```
const addedHeight = measureContentHeight(
  VStack({}, olderMessages.map(renderMessage)),
  { width: historyContentWidth },
);

scrollOffset += addedHeight;
```
- Defined in core/src/layout.ts:326