Redmine

The image explanation, states in red: move diff-number forward.

This means: move to the next version that introduces an actual difference (don't blindly move to the next number).

Here's an example for determining revisions that actually introduce changes:
Consider Revision 516: 570 trunk/app/controllers/account_controller.rb

Here we should display the versions that introduced the actual differences...
Maby like this: Revision 514(516): 567(570) trunk/app/controllers/account_controller.rb

How do we determine 514 and 567?

When was trunk/app/controllers/account_controller.rb@ 516 last changed?

svn info http://svn.redmine.org/redmine/trunk/app/controllers/account_controller.rb@516 | grep -e "^Last Changed Rev: " | cut -c19-

When was trunk/app/controllers/account_controller.rb@ 570 last changed?

svn info http://svn.redmine.org/redmine/trunk/app/controllers/account_controller.rb@570 | grep -e "^Last Changed Rev: " | cut -c19-

Redmine should show which version introduced the changes.

To determine versions prior to 514 (that introduced changes) use:

svn log -q http://svn.redmine.org/redmine/trunk/app/controllers/account_controller.rb@514 -l 5 -r 513:1 | grep -E -e "^r[[:digit:]]+" -o | cut -c2-

To determine versions after to 567 (that introduced changes) use:

svn log -q http://svn.redmine.org/redmine/trunk/app/controllers/account_controller.rb@567 -l 5 -r 568:HEAD | grep -E -e "^r[[:digit:]]+" -o | cut -c2-

To determine versions between 514 and 567 (that introduced changes) use:

svn log -q http://svn.redmine.org/redmine/trunk/app/controllers/account_controller.rb@514 -l 5 -r 515:566 | grep -E -e "^r[[:digit:]]+" -o | cut -c2-

Thus any navigation should show us the versions that actually introduced changes. If we happen to land on a version that does not introduce changes, the put it in brackets and show that "Last Changed Rev".

Summary for the above: the changeset from *516*: 570 is equivalent with the changeset *514*: 567 (for path trunk/app/controllers/account_controller.rb)