Fix app crash when there is repeated SLEEP at the end of the "lines" …

…slice (#446)

I found the issue while testing a low value of 5ms for sleepThreshold

record.go

@@ -152,6 +152,9 @@ func inputToTape(input string) string {
 		repeat := 1
 		for lines[i] == lines[i+repeat] {
 			repeat++
+			if i+repeat == len(lines) {
+				break
+			}
 		}
 		i += repeat - 1
 

record_test.go

@@ -66,3 +66,12 @@ func TestInputToTapeLongSleep(t *testing.T) {
 		t.Fatalf("want:\n%s\ngot:\n%s\n", want, got)
 	}
 }
+
+func TestInputToTape_RepeatedSleepAfterExit(t *testing.T) {
+	input := "SLEEP\nexit\nSLEEP\nSLEEP"
+	want := "Sleep 500ms\nType \"exit\"\nSleep 1s\n"
+	got := inputToTape(input)
+	if want != got {
+		t.Fatalf("want:\n%s\ngot:\n%s\n", want, got)
+	}
+}