Fix copying of files.

cista/protocol.py

@@ -75,13 +75,16 @@ class Cp(ControlBase):
         if not dst.is_dir():
             raise BadRequest("The destination must be a directory")
         for p in sel:
-            # Note: copies as dst rather than in dst unless name is appended.
-            shutil.copytree(
-                p,
-                dst / p.name,
-                dirs_exist_ok=True,
-                ignore_dangling_symlinks=True,
-            )
+            if p.is_dir():
+                # Note: copies as dst rather than in dst unless name is appended.
+                shutil.copytree(
+                    p,
+                    dst / p.name,
+                    dirs_exist_ok=True,
+                    ignore_dangling_symlinks=True,
+                )
+            else:
+                shutil.copy2(p, dst)
 
 
 ControlTypes = MkDir | Rename | Rm | Mv | Cp