Why does “git stash push” cause “Unmerged paths: … both modified: …”?

Question

Q1: How can I reproduce this scenario? (I unsuccessfully tried to reproduce it)

Q2: What does this Unmerged paths:... both modified:... state mean?

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Answer 1

You're starting from a false premise: git stash push itself does not cause the problem. It merely suffers from the problem, once the problem exists.

(I unsuccessfully tried to reproduce it)

That is not surprising.