context: https://bugs.winehq.org/show_bug.cgi?id=55897
While implementing CopyFile2, I noticed that CopyFileEx does not respect the progress callback and never calls it. The tests too assume that it will not be invoked other than in the case of a file having multiple streams, which is not something that Wine supports.
I think it's simply not implemented, there is no other reason.
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There seem to have been multiple efforts to implement this functionality (in 2022 and 2013) but I can't tell find any reasoning for why they were not successful. Would implementing this be a desirable contribution?
Sure, I recall we had a bug report for missing callbacks.
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I don't know how to get assigned to an issue on Bugzilla. I read the Wine Developers Wiki but it doesn't seem to have the information, so I left a comment in the bug log itself.
Just mention that on a bug report, there is��an "Assigned to" field in bugzilla that you can set (not sure if regular permissions allow that). But most of the time it's not used, just create a MR, and mention it at the bug report comment, so that it is clear you're working on it.