Consider this:

<param name="A"/>
<param name="B" type="select">
    <options ...>
        <filter type="param_value" column="0" ref="A" keep="false"/>
    </options>
</param>

then this already works if A is a simple parameter (text, int, ...) but it failed if A is a select is a select parameter with multiple="true".

The filter also did not work if ref_attribute is used for data parameters with multiple="true" and collection inputs.

Also there were no test so far for the param_value filter.

• seems that one can only refer to parameters that are defined above, i.e. I might need to comment

  galaxy/test/functional/tools/filter_param_value.xml

  Line 16 in 23d5c97

  <filter type="param_value" column="0" ref="select2" keep="false"/>

  .. would call this another bug

I would like to call this a bug and backport it .. ?

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these contributions under Galaxy's current license.
• I agree to allow the Galaxy committers to license these and all my past contributions to the core galaxy codebase under the MIT license. If this condition is an issue, uncheck and just let us know why with an e-mail to galaxy-committers@lists.galaxyproject.org.