intermediate commit

* Implement move artifact action
* Fix widget update memory leak
  * update the highlights not during on each frame
  * do not update the unchanged label of a button
* Allow to exit the game by pressing 'q'
* Implement some cards from the magic set
* Improve permanent formatting
* Some tweaks to UnitAI code

1 files changed, 5 insertions, 3 deletions

diff --git a/go/game/pos.go b/go/game/pos.go
index 2a646a83..133f599b 100644
--- a/go/game/pos.go
+++ b/go/game/pos.go
@@ -9,12 +9,14 @@ type Position struct {
 	Y int
 }
 
-func (p *Position) String() string {
-	if *p == INVALID_POSITION() {
+const POSITION_FMT = "(%d, %d)"
+
+func (p Position) String() string {
+	if p == INVALID_POSITION() {
 		return "INVALID_POSITION"
 	}
 
-	return fmt.Sprintf("(%d, %d)", p.X, p.Y)
+	return fmt.Sprintf(POSITION_FMT, p.X, p.Y)
 }
 
 func INVALID_POSITION() Position {