t / t4135 / git-with spaces.diffon commit sub-process: print the cmd when a capability is unsupported (d3ba566)
   1diff --git a/post image.txt b/post image.txt
   2new file mode 100644
   3index 0000000..eff0c54
   4--- /dev/null
   5+++ b/post image.txt    
   6@@ -0,0 +1 @@
   7+postimage