Fixed offset error

gui/tasksetgui/TasksetDisplay.java

@@ -59,9 +59,15 @@ public class TasksetDisplay extends BoxPanel implements Observer, UpdateListener
             revalidate();
         }
 
+        // Add empty if exists
+        if (empty.isPresent()) {
+            add(empty.get());
+            revalidate();
+        }
+
         // This section fixes the offset from 
         // the lowest priority task to the Southern border.
-        int taskOffset = priorities.size()*35;
+        int taskOffset = (empty.isPresent()) ? (priorities.size() + 1)*35 : priorities.size()*35;
         if (offset - taskOffset > 0) {
             setMaximumSize(new Dimension(300, 35 + taskOffset));
             add(createVerticalStrut(offset - taskOffset));
@@ -70,12 +76,6 @@ public class TasksetDisplay extends BoxPanel implements Observer, UpdateListener
 
         // Mark the previously marked one.
         marked.ifPresent(taskGrid -> taskGrid.mark());
-
-        // Add empty if exists
-        if (empty.isPresent()) {
-            add(empty.get());
-            revalidate();
-        }
     }
 
     /*
@@ -128,8 +128,7 @@ public class TasksetDisplay extends BoxPanel implements Observer, UpdateListener
             emptyGrid.addEmptyListener(this);
             empty = Optional.of(emptyGrid);
 
-            add(emptyGrid);
-            revalidate();
+            update(taskset, null);
         }
     }