it will get enabled as soon as you save the changes to the conflicted file.When editing a conflict, four files are passed to the external tool: "base", "your" and "theirs", and a file for where to save the result named "merged". As soon as the "merged" file is saved, the button gets enabled.
Are you sure you replied to the correct topic? I can't follow, because I don't see any relation between your answer and the issue.The target file of a merge always exists, and the frequencey of whatever check should not matter. Please clarify. Thanks!Anyway, I will update to the new TSVN when there's one.