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Surprising semantics of "git add file"


Reading the manual, I realized that "it is the way it is (it works as documented)", but to me it's surprising, meaning: I feel it's wrong:
I have staged several files, and then I do "git add -interactive file" to add some selected changes from file.
After that a "git diff --cached file" just shows the changes added interactively, but when I "git add file" to commit those changes), even the unstaged changes from file are committed.
I feel this is inconsistent: At least "git diff --cached file" should behave like "git commit file", meaning "git commit file" should be fixed IMHO.
Or are there any reasonable use cased for that?

Ulrich Windl