Only markUpdate left to fix

gui/tasksetgui/TasksetDisplay.java

@@ -99,7 +99,6 @@ public class TasksetDisplay extends BoxPanel implements Observer, UpdateListener
         marked = Optional.of((TaskGrid) obj);
 
         for (TaskGrid tg : gridList) {
-            //if (marked.map(taskgrid -> taskgrid.equals(tg)).orElse(false)) marked = Optional.of(tg);
             tg.unmark();
         }
 
@@ -144,6 +143,10 @@ public class TasksetDisplay extends BoxPanel implements Observer, UpdateListener
             if (prio != -1) {
                 taskset.removeTask(prio);
                 marked = Optional.empty();
+                // Unmarks the rest of the grid
+                for (TaskGrid tg : gridList) {
+                    tg.unmark();
+                }
             }
         } catch (NoSuchElementException e) {}
     }