Focus new type assumption field

src/main/java/edu/kit/typicalc/view/main/TypeAssumptionField.java

@@ -62,6 +62,13 @@ public class TypeAssumptionField extends HorizontalLayout implements LocaleChang
         setId(ASSUMPTIONS_FIELD_ID);
     }
 
+    /**
+     * Focus the variable field of this element.
+     */
+    protected void focus() {
+        variableInputField.focus();
+    }
+
     /**
      * Gets the variable of the type assumption.
      *

src/main/java/edu/kit/typicalc/view/main/TypeAssumptionsArea.java

@@ -94,6 +94,7 @@ public class TypeAssumptionsArea extends Dialog implements LocaleChangeObserver
         });
         assumptionContainer.add(assumption);
         fields.add(assumption);
+        assumption.focus();
     }
 
     private void onDeleteAllClick() {