Add diffs key to FileChange class

mergin/local_changes.py

@@ -45,6 +45,8 @@ class FileChange:
     history: Optional[dict] = None
     # some functions (MerginProject.compare_file_sets) are adding location dict to the change from project info
     location: Optional[str] = None
+    # list of diff filenames associated with this change
+    diffs: Optional[List[str]] = None
 
     def get_diff(self) -> Optional[FileDiffChange]:
         if self.diff:

mergin/test/test_local_changes.py

@@ -28,6 +28,7 @@ def test_local_changes_from_dict():
                 "path": "base.gpkg",
                 "size": 98304,
                 "version": "v1",
+                "diffs": ["diff"],
             }
         ],
     }