Ok, maybe then
1. find conflicts first
2. copy all non-conflicting files
3. ask user about conflicts
?
Thanks for your suggestion.
Unfortunately, that would be a huge change.
Instead of showing a window with a question on what to do with conflicting files, which blocks copying until user chooses an option
it would be nice to process all non-conflicting files and ask user about conflicting ones in a separate window, which would not block the copying process.