Make inputting nicer

gui/ui/app.slint

@@ -114,6 +114,12 @@ component AddView inherits VerticalLayout {
         height: 42px;
         input := LineEdit {
             font-size: 20px;
+            accepted(text) => {
+                if text != "" {
+                    State.add-to-list(text);
+                    input.text = "";
+                }
+            }
         }
 
         Rectangle {
@@ -124,7 +130,11 @@ component AddView inherits VerticalLayout {
             width: self.height;
             text: "+";
             clicked => {
-                State.add-to-list(input.text);
+                if input.text != "" {
+                    State.add-to-list(input.text);
+                    input.text = "";
+                }
+                input.clear-focus()
             }
         }
     }