'git show -c' omits hunk even though file was modified from all parents

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Git version 2.17.1

Commit C0 contains FileA which is empty.
Both branchA and branchB point to C0.

>From branchA I add the following contents to FileA (and then commit):
---
One
Two
Three


Seven
Eight
Nine
---

>From branchB I add the following contents to FileA (and then commit):
---
One
Four
Three


Seven
Ten
Nine
---

Note: I use two newlines so that git merge sees two hunks.

Case1: 

>From branchA I merge branchB and resolve the conflict as follows:
---
One
Two
Four
Three


Seven
Eight
Nine
---

As expected, 'git show -c' outputs the combined diff for both hunks, whereas 'git show -cc' only shows hunk1 and omits "uninteresting" hunk2.

Case2:

First I amend branchA so that the second hunk is the same as in branchB (note that the first hunk is still different between the 2 branches):
---
One
Two
Three


Seven
Ten
Nine
---

Then from branchA I merge branchB and resolve the conflict as follows (keeping only the changes from branchA):
---
One
Two
Three


Seven
Ten
Nine
---

I was expecting `git show -c` to output the combined diff for "uninteresting" hunk1, just as it did for hunk2 in case1. But it doesn't.
I realize that this is because fileA in the merge commit's tree is identical to what it was in branchA prior to the merge (so the output of 'git show -m' only outputs the diff for one parent). But I'm wondering if this is the intended behavior.

If it's not, then the '-c' section in 'man git log' that says "it lists only files which were modified from all parents" may be a bit confusing since this requirement seems to be met.

Thanks,
Ralph






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