Don't use tcell's Rune() for non-KeyRune events

According to tcell documentation, Rune() should only be used for KeyRune
events. Otherwise its return value is not guaranteed and should not be
relied upon.

This fixes issue #2947: Esc key not working on Windows, since tcell
sends lone Esc key event with rune == 0 on Unix but with rune == 27
(the keycode) on Windows.

internal/action/events.go

@@ -68,7 +68,7 @@ func (k KeyEvent) Name() string {
 		if k.code == tcell.KeyRune {
 			s = string(k.r)
 		} else {
-			s = fmt.Sprintf("Key[%d,%d]", k.code, int(k.r))
+			s = fmt.Sprintf("Key[%d]", k.code)
 		}
 	}
 	if len(m) != 0 {
@@ -155,11 +155,14 @@ func (m MouseEvent) Name() string {
 func ConstructEvent(event tcell.Event) (Event, error) {
 	switch e := event.(type) {
 	case *tcell.EventKey:
-		return KeyEvent{
+		ke := KeyEvent{
 			code: e.Key(),
 			mod:  metaToAlt(e.Modifiers()),
-			r:    e.Rune(),
-		}, nil
+		}
+		if e.Key() == tcell.KeyRune {
+			ke.r = e.Rune()
+		}
+		return ke, nil
 	case *tcell.EventRaw:
 		return RawEvent{
 			esc: e.EscSeq(),