How can I instruct Perforce to merge instead of overwrite or revert when unshelving a file?

Question

How can I instruct Perforce to merge changes into an existing, open, and modified file in the workspace when unshelving a file shelved in the depot? The only options that Perforce appears to offer the user is to overwrite or revert the existing file in the workspace, but this does not allow, for example, to unshelve and integrate changes to the same file from multiple change lists. Is there a way around this limitation?

Answer 1

What I typically do is right-click on the shelved file and select "Diff Against Workspace File". When you open up the Diff tool, you can select a button in the toolbar to "Edit file in right pane". This essentially starts a two-way merge. With each difference you can select the changes you want from the shelved file (differences are selected from the workspace file by default).

However, it would be nice if Perforce added a type of merge feature to do this more automatically.