More go fmt. That completes the main package go fmt. Won't bother with test or tools.

area.go

@@ -4,10 +4,10 @@ package ui
 
 import (
 	"fmt"
-	"sync"
 	"image"
-	"unsafe"
 	"reflect"
+	"sync"
+	"unsafe"
 )
 
 // Area represents a blank canvas upon which programs may draw anything and receive arbitrary events from the user.
@@ -186,6 +186,7 @@ type KeyEvent struct {
 
 // ExtKey represents keys that are not in the typewriter section of the keyboard.
 type ExtKey uintptr
+
 const (
 	Escape ExtKey = iota + 1
 	Insert        // equivalent to "Help" on Apple keyboards
@@ -262,6 +263,7 @@ func (e KeyEvent) EffectiveKey() byte {
 // There is no way to differentiate between left and right modifier keys.
 // As such, what KeyEvents get sent if the user does something unusual with both of a certain modifier key at once is undefined.
 type Modifiers uintptr
+
 const (
 	Ctrl  Modifiers = 1 << iota // the keys labelled Ctrl or Control on all platforms
 	Alt                         // the keys labelled Alt or Option or Meta on all platforms

area_darwin.go

@@ -3,8 +3,8 @@
 package ui
 
 import (
-	"unsafe"
 	"image"
+	"unsafe"
 )
 
 // #include <stdlib.h>