Change style of tasks that cannot be moved in the Gantt

Set a new class for fixed tasks showing a shadow under the task box and changing
the border color.

FEA: ItEr77S04BugFixing

ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java

@@ -218,6 +218,9 @@ public class TaskComponent extends Div implements AfterCompose {
                     : "";
         } else {
             cssClass += task.isInCriticalPath() ? " critical" : "";
+            if (!task.canBeExplicitlyMoved()) {
+                cssClass += " fixed";
+            }
         }
         cssClass += " " + task.getAssignedStatus();
         if (task.isLimiting()) {

libreplan-webapp/src/main/webapp/planner/css/ganttzk.css

@@ -155,6 +155,12 @@
     z-index : 99 !important;
 }
 
+/* Fixed box */
+.fixed {
+    box-shadow: 3px 3px 3px #999;
+    border: #999;
+}
+
 /* Task lane properties */
 .row {
     height: 12px;