can't set a different filter in file:inbound-channel-adapter and scanner?

Below is part of my Spring Integration config :

<bean id="recursiveScanner" class="org.springframework.integration.file.RecursiveLeafOnlyDirectoryScanner" >
    <property name="filter" ref="skipTmpFileFilter" />
</bean>

<bean id="skipTmpFileFilter" class="org.springframework.integration.file.filters.RegexPatternFileListFilter">
    <constructor-arg value="^[^~].*"/>
</bean>

<file:inbound-channel-adapter directory="${inbound.folder}"
                              scanner="recursiveScanner" 
                              id="fileChannel" 
                              filter="fileNameFilter">
    <integration:poller id="poller" fixed-delay="10000" />
</file:inbound-channel-adapter>

As you can see, I'd like to define 2 different filters :

• one to skip temp files, in the recursiveScanner


• one more advanced in which I have defined some other patterns, fileNameFilter (details of which are not relevant, so I'm not providing it)

What I see when I launch this in debug mode is that first, skipTmpFileFilter is set in recursiveScanner, but it is overwritten by fileNameFilter a bit after, making skipTmpFileFilter ineffective.

Is it the intended behavior or a bug ? I think it would make sense to be able to configure 2 different filters, one generic (in scanner) and one more specific (in the inbound adapter). Here, I'm kind of forced to use a composite filter.

Thanks

Vincent