BUG: Convert to native path before checking if absolute

Author: DWesl

git/repo/base.py

@@ -29,6 +29,7 @@
 from git.util import (
     Actor,
     finalize_process,
+    cygpath,
     decygpath,
     hex_to_bin,
     expand_path,
@@ -175,7 +176,10 @@ def __init__(
         if not epath:
             epath = os.getcwd()
         if Git.is_cygwin():
-            epath = decygpath(epath)
+            # Given how the tests are written, this seems more likely to catch
+            # Cygwin git used from Windows than Windows git used from Cygwin.
+            # Therefore changing to Cygwin-style paths is the relevant operation.
+            epath = cygpath(epath)
 
         epath = epath or path or os.getcwd()
         if not isinstance(epath, str):