IMHO a really better solution is DiffMerge:
https://sourcegear.com/diffmerge/

Also GUI way of 3-file comparing, folder comparing, ...

BUT : possibility to merge as "PREPEND" and "APPEND" because not everything
should be merged as "OVERWRITE" ...

I use it some time now in PSP in combination with the integrated script:

Alt+F1 selects the active file as the first file (FILE1-new)
Alt+F2 selects the active file as the second file (FILE2-old)
Ctrl+Alt+C opens DiffMerge and compares FILE1 & FILE2

After aplying changes, PSP offers the possibility to accept the changes from
DiffMerge!

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PSPad freeware editor http://www.pspad.com

Odpovedet emailem