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https://issues.apache.org/jira/browse/MYFACES-3117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025725#comment-13025725
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Jakob Korherr commented on MYFACES-3117:
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Another idea: we could provide a way to not limit the serialized view states in 
the session per quantity (currently 20), but per timeout (e.g. 10 minutes). 
This would most certainly also solve the problem, right?

> Current server state saving implementation prevents multi-window usage
> ----------------------------------------------------------------------
>
>                 Key: MYFACES-3117
>                 URL: https://issues.apache.org/jira/browse/MYFACES-3117
>             Project: MyFaces Core
>          Issue Type: Bug
>          Components: General
>    Affects Versions: 2.0.6-SNAPSHOT
>         Environment: myfaces core trunk
>            Reporter: Martin Kočí
>            Priority: Critical
>         Attachments: MYFACES-3117.patch
>
>
> Problem:
> open two tabs (or windows) in browser with view:
> <h:body>
>         <h:form id="formId">
>             <h:commandButton value="Click me 20x!" />
>         </h:form>
>  </h:body>
> then click the button on the first tab 20x or more -> then click the button 
> on the second tab -> you will get the most beloved ViewExpiredException.
> Reason:
> oam.SerializedViewCollection drops the saved state for 2. tab from map. 
> Suggestion:
> remove the successfully restored view state from map. This can be done, 
> because each SerializedViewKey is unique over *all requests* for one 
> HttpSession -  see 
> DefaultFaceletsStateManagementHelper.nextViewSequence(FacesContext). Because 
> each request has unique sequence number, we can the "just restored" one 
> remove from the map, because it can never come from  client again.
> Open question: the previous statement is true except the double submit 
> problem:       JAVASERVERFACES_SPEC_PUBLIC-559. In this case, server can 
> process same request (with the same sequence number) twice.

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