CHE-2775 Amount of machines is not correctly displayed in process tree (#2885)

Signed-off-by: Vitaliy Guliy <vguliy@codenvy.com>

plugins/plugin-machine/che-plugin-machine-ext-client/src/main/java/org/eclipse/che/ide/extension/machine/client/processes/panel/ProcessesPanelPresenter.java

@@ -180,6 +180,42 @@ public class ProcessesPanelPresenter extends BasePresenter implements ProcessesP
         eventBus.addHandler(DownloadWorkspaceOutputEvent.TYPE, this);
     }
 
+    /**
+     * Updates list of the machines from application context.
+     */
+    public void updateMachineList() {
+        if (appContext.getWorkspace() == null) {
+            return;
+        }
+
+        List<MachineEntity> machines = getMachines(appContext.getWorkspace());
+        if (machines.isEmpty()) {
+            return;
+        }
+
+        ProcessTreeNode machineToSelect = null;
+        for (MachineEntity machine : machines) {
+            if (machine.isDev()) {
+                provideMachineNode(machine, true);
+                machines.remove(machine);
+                break;
+            }
+        }
+
+        for (MachineEntity machine : machines) {
+            provideMachineNode(machine, true);
+        }
+
+        if (machineToSelect == null) {
+            machineToSelect = machineNodes.entrySet().iterator().next().getValue();
+        }
+
+        view.selectNode(machineToSelect);
+
+        workspaceAgent.setActivePart(ProcessesPanelPresenter.this);
+    }
+
+
     @Override
     public void go(AcceptsOneWidget container) {
         container.setWidget(view);