3-way directory comparison behavior

["Wohlmuth, Oliver" <Oliver Wohlmuth socionext com>]

Hello,

I have to merge code changes on a large directory tree. The top-level directory layout is a follows:

- DIR_V1: (version 1 source tree)
- DIR_V1_MOD: (version 1 source tree with my local modifications)
- DIR_V2: (version 2 source tree.  It is based on DIR_V1)

I invoke meld as follows: meld DIR_V1 DIR_V1_MOD DIR_V2

Now I want the see the changes between DIR_V1 <=> DIR_V1_MOD and merge them into DIR_V2

I was assuming that meld colors the files (to indicate the status) in the three columns as follows:
LEFT colum: LEFT <=> MIDDLE diff status
RIGHT colum: MIDDLE <=> RIGHT diff status
MID colum:  Superset of MIDDLE <=> LEFT + MIDDLE <=> RIGHT diff status

This way I could navigate from one change to the next in the left column to get to all my DIR_V1 <=> 
DIR_V1_MOD changes.

If I do a 3-way file comparison it seems to behave like this.

Can someone please explain the behavior for 3-way directory/file diffs or point me to the documentation for 
this?
Is there a way to get meld to behave as described above?

Thanks,
Oliver






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