This PR renames the `IconElement` component to just `Icon`.
This better matches the rest of our components, as `IconElement` was the
only one using this naming convention.
The `Icon` enum has been renamed to `IconName` to free up the name.
I was trying to come up with a way that would allow rendering an
`Icon::Zed` directly (and thus make the `IconElement` a hidden part of
the API), but I couldn't come up with a way to do this cleanly.
Release Notes:
- N/A
This PR fixes the inconsistent sizing between the buffer search and the
project search when both elements have both a primary and secondary item
shown in the toolbar.
Release Notes:
- Fixed some inconsistent sizing in the buffer search and project search
when both have two rows of tools in the toolbar.
Rather than adding primary toolbar item that renders as empty,
don't add an item at all. This prevents spurious spacing from
being added after other primary toolbar items.