Show diff when creating a new comment (interactive_review)

Note that the diff is only shown, if it was requested before (that is
the "i" command was issued). The new behavior is consistent with the
other commands like "a", "d" etc.

osc/core.py

@@ -7375,7 +7375,11 @@ def request_interactive_review(apiurl, request, initial_cmd='', group=None,
                 print('Aborting', file=sys.stderr)
                 raise oscerr.UserAbort()
             elif repl == 'm':
-                comment = edit_text()
+                if tmpfile is not None:
+                    tmpfile.seek(0)
+                    comment = edit_message(footer=tmpfile.read())
+                else:
+                    comment = edit_text()
                 create_comment(apiurl, 'request', comment, request.reqid)
             elif repl == 'b' and src_actions:
                 print_source_buildstatus(src_actions)