Add comprehensive tests for edge depth extension, empty image edits, and material view adaptation

- Introduced `test_edge_depth.py` to validate the functionality of edge depth extension, ensuring core alpha preservation, proper depth handling, and edge padding behavior.
- Created `test_empty_image_edits.py` to verify the behavior of image edits in Blender, focusing on shared edits, preservation of image properties, and handling of failed operations.
- Developed `test_material_view_adaptation.py` to test material adaptation preferences, ensuring color space and alpha settings are correctly applied and preserved across various scenarios.

tests/test_image_data.py

@@ -112,7 +112,9 @@ def load_image_modules():
         package.__path__ = []
 
     loaded = []
-    with patch.dict(sys.modules, {"bpy": fake_bpy, **packages}):
+    preferences = ModuleType("anyimage.preferences")
+    preferences.configured_material_view_adaptation = lambda: True
+    with patch.dict(sys.modules, {"bpy": fake_bpy, "anyimage.preferences": preferences, **packages}):
         for module_name, module_path in module_paths:
             specification = importlib.util.spec_from_file_location(
                 module_name,
@@ -221,14 +223,18 @@ class ImageDataTest(unittest.TestCase):
                     raise TypeError("unsupported color space")
                 self._name = value
 
-        image = SimpleNamespace(colorspace_settings=ColorSpaceSettings())
+        image = SimpleNamespace(
+            colorspace_settings=ColorSpaceSettings(),
+            users=0, use_fake_user=False, alpha_mode="STRAIGHT",
+        )
         scene = SimpleNamespace(
             view_settings=SimpleNamespace(view_transform="ACES 2.0")
         )
 
-        result = self.image_depth.set_material_color_space(image, scene)
+        result = self.image_depth.configure_material_color_image(image, scene)
 
-        self.assertEqual(result, "sRGB")
+        self.assertIs(result, image)
+        self.assertEqual(image.alpha_mode, "PREMUL")
         self.assertEqual(image.colorspace_settings.name, "sRGB")
 
     def test_is_animated_image_accepts_movie_and_sequence(self):