Strange behavior on Undo after deleting of files+drag'n'drop

[lredor]

I observed an unexpected behavior on an undo with the following scenario...

• Import the project "DesignerTestProject" from DesignerTestProject.zip (it contains data used in org.eclipse.sirius.tests.swtbot.BorderedNodeCreationTest).
• Delete the 3 files contained in this project
• Expected: Dialogs are displayed to close the session and then to inform that the project is now invalid.
• Copy the 3 files from /org.eclipse.sirius.tests.swtbot/data/unit/dragAndDrop/tc-1041 in this project
• Open the diagram "new TC1041 representation 2 Blank"
• Drag'n'drop "P1" from the Model Explorer view to the diagram
• Expected: "P1" appears in the diagram.
• Undo (through Ctrl+Z)
• Expected: "P1" is deleted from the diagram.
• Observed: The 3 files deleted in the second step are restored. A dialog appears to inform that the project is invalid (because it contains 2 aird files).
  

[lredor]

First remark: In the Edit menu, the Undo command is named "Undo Delete Resource" and not "Undo Drop Elements". Maybe the undo context is not correct?