title: How can I instruct Perforce to merge instead of overwrite or revert when unshelving a file?
body: <p>How can I instruct <a href="http://www.perforce.com/">Perforce</a> 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?</p>