HotKey can set focus

- Fix AbstractView to return focus info for hotkey handler
- TerminalUI sets focus from returned key handling
  for hotkeys
- Fixes #881

spring-shell-core/src/main/java/org/springframework/shell/component/view/TerminalUI.java

@@ -273,6 +273,9 @@ public class TerminalUI implements ViewService {
 			if (handler != null) {
 				KeyHandlerResult result = handler.handle(KeyHandler.argsOf(event));
 				if (result.consumed()) {
+					if (result.focus() != null) {
+						setFocus(result.focus());
+					}
 					return;
 				}
 			}

spring-shell-core/src/main/java/org/springframework/shell/component/view/control/AbstractView.java

@@ -189,16 +189,18 @@ public abstract class AbstractView extends AbstractControl implements View {
 		log.trace("getHotKeyHandler() {}", this);
 		KeyHandler handler = args -> {
 			KeyEvent event = args.event();
+			View view = null;
 			boolean consumed = false;
 			Integer key = event.key();
 			if (key != null) {
 				KeyBindingValue keyBindingValue = getHotKeyBindings().get(key);
 				if (keyBindingValue != null) {
+					view = this;
 					consumed = dispatchKeyRunCommand(event, keyBindingValue);
 				}
 
 			}
-			return KeyHandler.resultOf(event, consumed, null);
+			return KeyHandler.resultOf(event, consumed, view);
 		};
 		return handler;
 	}