Patches that end in -Dx (where x is any number) are no longer tested by the test bot. So, 973432-4.foo-D7.patch will *not* be tested anymore. This change was made to facilitate contrib testing, where the test bot was always ignoring D6 patches even if a contrib module supported D6 tests. The test bot currently uses the version the issue is pointing to so it can figure out what version to test against. If you want a patch tested, don't specify a version in the filename, just let the issue define that. If you want a patch that's not tested (since it's for a different version than the issue is pointing to), use -Dx.