Currently, if you want to compare the current working copy of a file with older revisions (you don't know the numbers of) in trunk, you have to follow these steps:

1. Right-click the file
2. Choose 'Subversion' > 'Diff' > 'Diff To...' from the context menu
3. Select the repository file in trunk within the 'Select Tree To Diff' dialog (may not be needed when bug 255314 is fixed)
4. Click 'Search...' within the 'Select Tree To Diff' dialog besides the repository revision
5. Click on 'List' within the 'Search Revisions' dialog
6. Select a revision
7. Click 'OK'
8. Click 'Select'

This process is pretty cumbersome for just comparing two revisions with each other.

For example the process in Eclipse with installed Subclipse looks like this:
1. Right-click the file
2. Choose 'Compare With' > 'Revision...' from the context menu
3. Double-click a revision within the comparision view

If you then want to change the revision you're comparing to in NetBeans, you need to do this:
1. Click the 'to' list within the comparison view
2. Click there on 'Select...'
3. Select the repository file in trunk within the 'Select Tree To Diff' dialog (may not be needed when bug 255314 is fixed)
4. Click 'Search...' within the 'Select Tree To Diff' dialog besides the repository revision
5. Click on 'List' within the 'Search Revisions' dialog
6. Select a revision
7. Click 'OK'
8. Click 'Select'

In Eclipse:
1. Double-click a revision within the comparision view


So I suggest to integrate the revision search into the comparison view and do an automatic search when the comparison view is opened.

This may be split into several smaller issues if needed.

Sebastian