Merge git://ozlabs.org/~paulus/gitk

* git://ozlabs.org/~paulus/gitk:
  gitk: Fix GIT_TRACE issues

Author: gitster

gitk-git/gitk

@@ -11533,6 +11533,11 @@ if {[catch {package require Tk 8.4} err]} {
     exit 1
 }
 
+# Unset GIT_TRACE var if set
+if { [info exists ::env(GIT_TRACE)] } {
+    unset ::env(GIT_TRACE)
+}
+
 # defaults...
 set wrcomcmd "git diff-tree --stdin -p --pretty"