Inconsistent proportion in copy progress bars

[haiqu]

The attached snapshot shows three copies in progress. The top and bottom copies show a copy progress bar proportionate to progress, whilst the centre bar has travelled too far.

[haiqu]

Disproportionate progress bar (centre)

[stippi]

The progress bars are based on the amount of data (bytes) to copy, not on the amount of files. Unfortunately, there is a penalty for creating files and copying attributes, which results in the progress bars filling "unevenly" (ie not with perfectly constant speed). Should I leave this open to mean that the last issue I mentioned should be fixed some day?

[axeld]

This cannot be "fixed"; you don't know the penalty of single file operations. A single file count is certainly no solution, at least.

And while you can estimate the ETA of a file operation, progress bars shouldn't really be based on that, as they could then jump around.