[PATCH] "Show diffences" when selecting multiple revisions in the log dialog

hi,

the following patch fixes two bugs which occur if multiple revisions are
selected in the log dialog

1. If two revisions are selected "Show diffences" uses the two selected
revision numbers. Correct would be one revision below the lower revision
number.
2. if more than two revisions are selected no more than two selected
revisions are used to calculate the revision range.

Both bugs are fixed in this patch. I intend to commit them in two revisions
and merge it into 1.4.x.

Please review: Is that min(...) I introduced really needed or are the
revision numbers always decreasing while iterating. In this case the
min(...) could be removed.

Should I wait for my commit after 1.4.1 is released?

Tobias

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