Reget on file copying misreports progress

[Paweł Sakowski]

As in the subject. Let's:

1. Create /tmp/a with size of 200 MB (e.g. dd if=/dev/zero).
2. Create /tmp/b, 180 MB.
3. Copy (F5) /tmp/a => /tmp/b.
4. File exists, let's choose "Reget".

Now the progress bar runs from 0% to 20%, then the copying ends. It
seems that the progress is determined by dividing the amount of data
transferred by the file size, which doesn't work properly when
regetting.

The algorithm should be changed in either of two ways:

- data_transferred/(a_size-b_size), which gives progress between 0%-100%

- (b_size+data_transferred)/a_size, which gives progress between
80%-100%

I'm not sure which one is better.

According to FAQ #9.3 I'm mentioning I'm not on the mailing list :)

-- 
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|     Avoid the Gates of Hell.     :              Pawel Sakowski     |
|            Use Linux.            :     <pawel at sakowski.eu.org>     |
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