Search field

ui.SearchField creates a field for searching, editing a *string: a magnifying glass, the text, and a button clearing it while it holds any, as Escape does then. It shows "Search" while empty. Changed reports a change, and Submitted Enter.

if ui.SearchField(c, &app.query).Label("Search mail").Changed() {
	app.filter()
}

To search as the user types, filter on Changed; for searches that take time, search on Submitted, or after a pause with c.After.

Accessibility

Assistive technology sees a search field (AXSearchField on macOS), named by its Label.