Closed
Description
Vue.js version
2.0.3
Reproduction Link
https://jsfiddle.net/r4jpy72a/1/
Steps to reproduce
Open the jsfiddle, click the button multiple times.
What is Expected?
Both component not to be re-rendered if the props are not changing.
What is actually happening?
The functional component is re-rendered when the props are unchanged.
The regular component exhibits the expected behaviour.
To optimise and avoid expensive renders in a complex application, I'm moving most of the HTML logic to functional components and expect them not to be re-rendered if the data passed doesn't change.
If this is intended, perhaps the docs should reflect this quirk, but I don't see any reason why we should always call the render function when we can safely assume the resulting HTML to be unchanged (same input == same output).