Don't wait for timeout to expire if button has only a single symbol

src/hdy-dialer-cycle-button.c

@@ -79,7 +79,7 @@ button_clicked_cb(HdyDialerCycleButton *self, GdkEventButton *event)
   g_return_val_if_fail (HDY_IS_DIALER_CYCLE_BUTTON (self), FALSE);
 
   /* Only cycle if we have more than one symbol */
-  if (!strlen(hdy_dialer_button_get_letters (HDY_DIALER_BUTTON (self))))
+  if (strlen(hdy_dialer_button_get_letters (HDY_DIALER_BUTTON (self))) < 2)
     return FALSE;
 
   if (hdy_dialer_cycle_button_is_cycling(self)) {

src/hdy-dialer.c

@@ -87,7 +87,7 @@ hdy_cycle_button_clicked (HdyDialer *self,  HdyDialerCycleButton *btn)
   if (priv->cycle_btn != btn) {
     stop_cycle_mode (self);
     priv->cycle_btn = btn;
-  } else if (priv->number->len) {
+  } else if (priv->number->len && hdy_dialer_cycle_button_is_cycling (btn)) {
     hdy_string_utf8_truncate (priv->number, hdy_string_utf8_len (priv->number)-1);
   }