In a table with dropdowns in the row itemrenderer, only the first dropdown's value can be changed

**Bug:**
In a table where the row item renderer has a dropdown in it, all dropdowns are interactive, but only the first row will update to show the value selected in it.

**Issue started:**
I can't find the bisect.

**Blast radius:**
At least affects haxeui-heaps and haxeui-html. 

**Minimal repro:**
https://haxeui.org/builder/?9c5d982d
(Try to change the second or third row's dropdowns)