When the name of a changed file contains non-Latin characters, delta shows it as renamed instead of just the contents being changed.
To reproduce:
$ git init
$ echo one > привет.txt; echo three > hello.txt
$ git add .
$ echo two > привет.txt; echo four > hello.txt
$ git diff
Delta output:
Note the headers for the two files:
...
hello.txt
...
a/\320\277\321\200\320\270\320\262\320\265\321\202.txt ⟶ b/\320\277\321\200\320\270\320\262\320\265\321\202.txt
...
Raw git diff output:
$ git --no-pager diff
diff --git a/hello.txt b/hello.txt
index 2bdf67a..8510665 100644
--- a/hello.txt
+++ b/hello.txt
@@ -1 +1 @@
-three
+four
diff --git "a/\320\277\321\200\320\270\320\262\320\265\321\202.txt" "b/\320\277\321\200\320\270\320\262\320\265\321\202.txt"
index 5626abf..f719efd 100644
--- "a/\320\277\321\200\320\270\320\262\320\265\321\202.txt"
+++ "b/\320\277\321\200\320\270\320\262\320\265\321\202.txt"
@@ -1 +1 @@
-one
+two