After unlocking a document, cache should be invalidated

After clicking on the lock/unlock button on a document, the cache is not invalidated. A problem of refreshment occurs on widgets if they're based on the lock mechanism.
For example, in a tab, add a widget displaying the owner of the lock. If the document is unlock, the widget is hidden. But, after clicking on "lock/unlock" button, the widget is not re-rendered so it's still hidden or visible, depending of the previous state.