FIX: Update ApplyVDM to handle 4D inputs (#3500)

* extend apply VDM functionality to imaging data containing multiple frames (e.g. fMRI)

Authored-by: Fabio Bernardoni <[email protected]>

Author: fabioboh

nipype/interfaces/spm/preprocess.py

@@ -337,7 +337,11 @@ class ApplyVDM(SPMCommand):
     def _format_arg(self, opt, spec, val):
         """Convert input to appropriate format for spm"""
 
-        if opt in ["in_files", "vdmfile"]:
+        if opt == 'in_files':
+            return scans_for_fnames(
+                ensure_list(val), keep4d=False, separate_sessions=False
+            )
+        if opt == 'vdmfile':
             return scans_for_fname(ensure_list(val))
         return super(ApplyVDM, self)._format_arg(opt, spec, val)