'git rebase' silently drops changes?

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Hello,

I recently ran into an annoying problem: 'git rebase' apparently
silently drops changes in non-conflicting paths of merge commits
(git version 1.9.3). 

Is it a bug or feature? Is there a way to flatten history using rebase,
yet preserve manual changes found in merge commits?

Here is simplified reproduction of what I've encountered:

<SCRIPT>
git init t
cd t
git config rerere.enabled true

echo "I" > a; git add a
echo "I" > b; git add b
git commit -am "I"

git checkout -b test

echo "B" >> b; git commit -m "B" -a

git checkout master

echo "A" >> a
git commit -am "A"

git merge --no-edit test

# Clean merge, but result didn't compile, so I fixed it and
# amended the merge:
echo "Precious!" >> a # [!] This is modification that gets lost
git commit --amend --no-edit -a
cat a

# Now rebase my work.
git rebase -f HEAD~1

# What? Where is my "Precious" change in "a"???
cat a
</SCRIPT>

I.e., the modification marked [!] was silently lost during rebase!

-- 
Sergey.
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