on project closing, clear the status bar log message

platform/lang-impl/src/com/intellij/notification/EventLog.java

@@ -120,6 +120,10 @@ public class EventLog implements Notifications {
     }
     view.print("\n", ConsoleViewContentType.NORMAL_OUTPUT);
 
+    notifyStatusBar(project, mainText);
+  }
+
+  private static void notifyStatusBar(Project project, @Nullable String mainText) {
     final IdeFrame frame = WindowManager.getInstance().getIdeFrame(project);
     if (frame != null) {
       final StatusBar statusBar = frame.getStatusBar();
@@ -172,6 +176,11 @@ public class EventLog implements Notifications {
       }
       myGlobalNotifications.clear();
     }
+
+    @Override
+    public void projectClosed() {
+      notifyStatusBar(myProject, null);
+    }
   }
 
   public static ProjectTracker getProjectComponent(Project project) {

platform/platform-impl/src/com/intellij/openapi/wm/ex/StatusBarEx.java

@@ -54,5 +54,5 @@ public interface StatusBarEx extends StatusBar, Disposable {
   @Nullable
   String getInfoRequestor();
 
-  void setLogMessage(String text);
+  void setLogMessage(@Nullable String text);
 }

platform/platform-impl/src/com/intellij/openapi/wm/impl/status/StatusPanel.java

@@ -16,6 +16,7 @@
 package com.intellij.openapi.wm.impl.status;
 
 import com.intellij.notification.impl.NotificationsManagerImpl;
+import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.project.ProjectManager;
@@ -88,12 +89,20 @@ class StatusPanel extends JPanel {
   }
 
   public void setLogMessage(String text) {
+    ApplicationManager.getApplication().assertIsDispatchThread();
+
     myLogMessage = text;
     myLogTime = new Date();
     myDirty = false;
+
+    if (text == null) {
+      updateText(false, "");
+    }
   }
 
   public boolean updateText(boolean logAllowed, @Nullable String nonLogText) {
+    ApplicationManager.getApplication().assertIsDispatchThread();
+
     myLogMode = logAllowed && StringUtil.isEmpty(nonLogText) && myLogMessage != null;
 
     myShowLog.setVisible(myLogMode);