I've noticed some applications show the progress bar while the application is performing the selected process.
Then appears to look complete, but the necessary follow up processes aren't complete yet.

Using your example, maybe it is showing the progress for actually rendering it in the software,
but then during the time it takes to do the follow up process of actually writing the result to disk and making sure it got saved, the window seems unresponsive?
Or have I totally missed the target?

Maybe the window is still doing something, a screenshot may help.


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