git - Merge changes from grandchild branch without touching direct child? -

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we had branch a. needed improve functionality b planning on working on using function a. branched out a branch b. then, wanted improve specific functionality in a qualitative boost in performance of b branched out b , created c.

my question is, what's best way changes add in c , put them in a without changes b. should use cherry pick in cases this? there superior way accomplish this? result in messy error in git?

one cleaner way branch c a, not b.
, merge c a , rebase b on top of a
(or rebase b on top of c, while c isn't yet merged on a).

if branch c b , cherry-pick, might have issues later on when merge b (which might include c enhancement) a.
because cherry-picking can introduce duplicate commits and/or functional dependencies.
cherry-pick 1 branch when know never merge "one branch" anyway.


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