Change intent_to_add_files from using git status to git diff

pre_commit/git.py

@@ -150,18 +150,10 @@ def get_staged_files(cwd: str | None = None) -> list[str]:
 
 def intent_to_add_files() -> list[str]:
     _, stdout, _ = cmd_output(
-        'git', 'status', '--ignore-submodules', '--porcelain', '-z',
+        'git', 'diff', '--ignore-submodules', '--diff-filter=A',
+        '--name-only', '-z',
     )
-    parts = list(reversed(zsplit(stdout)))
-    intent_to_add = []
-    while parts:
-        line = parts.pop()
-        status, filename = line[:3], line[3:]
-        if status[0] in {'C', 'R'}:  # renames / moves have an additional arg
-            parts.pop()
-        if status[1] == 'A':
-            intent_to_add.append(filename)
-    return intent_to_add
+    return zsplit(stdout)
 
 
 def get_all_files() -> list[str]: