Workbench drag and drop of file icon always copies, and never deletes source file

[kiwi1969]

In Workbench,

• if drag a file to a different volume (any folder), the file is copied. This is handled correctly in ApolloOS
• if drag a file icon to a different location on same volume, the file should be moved (ie copy, then delete source file). This mode doesn't happen.

This is different behavior than normal Workbench 1.0 - 3.2

Steps to reproduce the behavior:

1. Drag the txt file from Apollo Desktop to RAM:
2. Doublelick on RAM:
3. Create new drawer in RAM:
4. Drag txt file to from RAM: to the new drawer in RAM:
5. See error - file is copied instead of moved

Expected behavior
expected txt file in RAM: to be deleted after successful copy to different drawer on same volume

Configuration
Apollo Device
V4 Stand Alone, 1Gb memory, ApolloOS 9.4.2

Additional context
As I believe we are using actual legacy Workbench program, I am thinking that there could be an error in dos.library, that prevents the delete from happening. eg SameVolume test (Just a guess)

[pauljsymonds]

would need to know what function in dos.library the Workbench move action calls? Is the Workbench code there also?