keys support case

src/device/output/key/char_test.go

@@ -3,6 +3,7 @@ package key
 import "testing"
 
 func TestFromChar(t *testing.T) {
+	caseSensitive = false
 	if got := FromChar('1'); got != N1 {
 		t.Error(got)
 	}
@@ -21,4 +22,11 @@ func TestFromChar(t *testing.T) {
 	if got := ToChar(-1); got != '?' {
 		t.Error(got)
 	}
+	caseSensitive = true
+	if got := FromChar('a'); got != A {
+		t.Error(got)
+	}
+	if got := FromChar('A'); got != AUpper {
+		t.Error(got)
+	}
 }