[news.eclipse.platform] Lightweight decorator cannot keep up with a view

[Serge_Yuschenko@xxxxxxxx (Serge Yuschenko)]

I use a lightweight decorator in my plugin to indicate a connection point
status (DISCONNECTED/CONNECTED/BUSY) in the TreeViewer. BUSY is an
intermediate state between CONNECTED/DISCONNECTED. On every state change I
call viewer.update( connection, null ) method. In approximately 50% of the
cases the decorator works properly. I.e. decoration goes all the way from
DISCONNECTED to CONNECTED. In another half of the cases the icon gets
stuck on BUSY.

I use a generic eclipse label decorator:

viewer.setLabelProvider(
WorkbenchLabelProvider.getDecoratingWorkbenchLabelProvider());

This is an example of decorator for CONNECTED state. There are similar
descriptions for DISCONNECTED and BUSY.

<extension
   point="org.eclipse.ui.decorators">
   <decorator
      lightweight="true"
      adaptable="true"
      label="connected"
      icon="icons/connected.gif"
      state="true"
      location="BOTTOM_RIGHT"
      id="com.xyz.decorator.connected">
      <enablement>
        <and>
          <objectClass
              name="com.xyz.ConnectionPoint">
          </objectClass>
          <objectState
             name="connected"
             value="true">
          </objectState>
        </and>
      </enablement>
   </decorator>
</extension>

The objectState is veryfied with an IActionFilter for an ConnectionPoint
object. I noticed when the decoration gets stuck on a BUSY state the
IActionFilter.testAttribute() is called only once that means the decorator
does not even try to update an icon on BUSY->CONNECTED state change.

I believe it is very hard to make any conclusion based merely on what I
said here unless it is some known issue. If someone is interested I can
provide a plugin demonstrating this behaviour.

Eclipse version 3.0.0, build 200406251208

Sincerely,

Serge