* Enforce a min width per tab
* Center the title within tab, regardless of icon
* Render icon over the top of the tab title
* Ensure there is always a fixed minimum amount of filler to the right of all tabs
Co-Authored-By: Nathan Sobo <nathan@zed.dev>
Now the Element trait is designed to be wrapped in a Lifecycle enum that gets placed inside an ElementBox. This allows the framework to store data on behalf of the Element implementation, such as sizes, bounds, and also implementation-specific LayoutState and PaintState types. This makes it easier to reason about which data is available in each Element method.
