NB: 200803311426 (instrumented build)
OS: WinXP Prof.
JDK: 1.6.0_10

This scenario was executed with the JFreeChart project (see http://wiki.netbeans.org/TS_61_ProjectsWizardsAndFreeform)

1. Go to File>New Project, select Java - New Java Project with Existing sources
2. Go to the fourth step of the dialog
3. Suppose the filenames in the "Included Files" or "Excluded Files" are longer than the list width
4. Scroll the horizontal scrollbar so that you can see the important part of the filename ("org\jfree\chart"), not the
junk in the beginning ("C:\Documents and Settings\...")
5. Try to type to the "Includes" field to include only specific file (type "org" there)
-> the scrollbar position resets to default, you do not see anything important in the lists again (you see just
"C:\Documents and Settings\...")

IMHO this step in this dialog should be completely remastered: There should be 2 lists titled verticaly, there should be
2 textfields (or comboboxes with editable text). Initially, every file should be in the "excluded" list. There would
also be JUST THE IMPORTANT PART of the filename in the list:

NO: "C:\Documents and Settings\user\NBProj\project1\sources\org\jSrc\..."
OK:  "org\jsrc\..."

The textfields would be used to select groups of files to include/exclude (if you typed "**" in the textbox bellow
included files list, all files would be selected in the included list). There would also be buttons to move selected
files from excluded/included to the other group.

I will draw you a picture;o).