match-trees: use hashcpy to splice trees

diff --git a/Documentation/config/core.txt b/Documentation/config/core.txt
index 30adc61195452ab0d18a3fbfcd7b04f756692875..d0e6635fe0b56b87826240bc80cfef40b722bef4 100644 (file)
--- a/Documentation/config/core.txt
+++ b/Documentation/config/core.txt
@@ -548,6 +548,12 @@ relatively high IO latencies.  When enabled, Git will do the
 index comparison to the filesystem data in parallel, allowing
 overlapping IO's.  Defaults to true.
 
+core.unsetenvvars::
+       Windows-only: comma-separated list of environment variables'
+       names that need to be unset before spawning any other process.
+       Defaults to `PERL5LIB` to account for the fact that Git for
+       Windows insists on using its own Perl interpreter.
+
 core.createObject::
        You can set this to 'link', in which case a hardlink followed by
        a delete of the source are used to make sure that object creation