https://bugs.kde.org/show_bug.cgi?id=382599

--- Comment #14 from Ragnar Thomsen <rthoms...@gmail.com> ---
Thanks for the testing. Here is some background.

When extracting using the context-menu of dolphin, the archive is listed first
to get different archive properties. The progress is then divided in two
phases: List and extract. In some cases the first phase is very fast, e.g. for
archives with few entries and the progress bar seems to jump to 50% instantly.
In other cases it can take some time. So this is the currently intended
behavior.

Regarding the cli7z plugin, it currently doesn't support percentage progress.
This is why the "ping-pong" progress is shown. This is due to the 7z executable
using some trick to output the percentage progress by overriding the current
line on the terminal and we are therefore unable to capture the progress output
with QProcess. To fix this we would have to find some other way to calculate
the progress. The libzip plugin which also can handle zip archives has working
percentage progress.

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