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This fixes an issue where Git would produce incorrect diffs; indicating that a given file was unchanged between the index and the workdir, even though it was different.

See issue #1042 (Drawing in dark mode broke in macOS 15.2).
Originally we used normal blends modes in dark mode as it looked better and was easy to see the overlaps.
The bug that manifests with the normal blend mode is some lines don't draw or if they do they draw almost like narrow triangles.
Given that the drawing code is just drawing lines with widths, I'm not sure how this can occur.
Moreover, I'm not sure why changing the blend mode would have any effect in them appearing or not.
Using multiply unfortunately changes the appearance of intersecting lines in dark mode to look less ideal.
I should probably file a feedback with Apple (if I do, I should add the FB# here).

I'm not 100% sure that the drawing code is bug free, but this code has worked fine unchanged for years.
If I (or anyone else) ever gets time to debug this, I'd love to better understand why changing the blend mode does anything (other than affect the blend mode).

* Fix checkoutFilesToWorkingDirectory deleting all files when empty path array is passed

* Allow cherry-picking/reverting on top of nil parent