Magit: patches that ignore some whitespace changes do not apply

Question

Context: I'm doing a merge, and fixed the conflicts manually. Now I'm trying to stage changes hunk-by-hunk and make a commit.

Issue: some hunks are not getting staged.

Here's the output from magit-process buffer

git … apply --cached -p0 --ignore-space-change -

error: patch failed: filename.cpp:1302

error: filename.cpp: patch does not apply

I was wondering what can be done to fix or investigate the issue. This is happening on Spacemacs on Fedora.

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With some experimentation, I've found that this issue only happens when the flag --ignore-all-space is set, i.e., if I unset this, then I can stage the same hunk.

edit: This could be a possible bug since I could reproduce it on a smaller issue. I've made a bug-report here

Answer 1

Magit now automatically uses git apply -C0 ... when appropriate. That causes the context lines to be ignored and as a result patches that ignore some whitespace changes apply again.

2.92.0 will be the first release to support this.