(Kdiff3 v0.9.91 on Windows 2000)
[In real life, the files have lines above below the attached files. The attached files are in a tar file because for some reason SourceForge doesn't allow files that are 20 bytes or less.]
(1) Load the files a, b and c as files A, B and C into Kdiff3 for merging.
(2) Select Merge->Choose A Everywhere.
(3) Highlight Y.
(4) Select Merge->Split Diff At Selection.
The following message box is displayed:
Kdiff3.exe has generated errors and will be closed by windows. You will need to restart the program.
An error log is being created.
Logged In: YES
user_id=1408756
Originator: NO
It was me (gervasel) who submitted this. SourceForge had for some reason logged me out without me realising.