center window on repaint; make sure selected file stays visible in textbox

main.go

@@ -130,6 +130,7 @@ func repaint(img *tk.LabelWidget, name string, opt tk.Opt) {
 	} else {
 		tk.App.WmTitle("why")
 	}
+	tk.App.Center()
 }
 
 func main() {
@@ -210,6 +211,7 @@ func main() {
 				if lb != nil {
 					lb.SelectionClear("0", "end")
 					lb.SelectionSet(curr - 1)
+					lb.See(curr - 1)
 				}
 			}
 		case "Down":
@@ -218,6 +220,7 @@ func main() {
 				if lb != nil {
 					lb.SelectionClear("0", "end")
 					lb.SelectionSet(curr + 1)
+					lb.See(curr + 1)
 				}
 			}
 		}
@@ -228,5 +231,6 @@ func main() {
 	// }))
 
 	tk.Pack(img)
+	tk.App.Center()
 	tk.App.Wait()
 }