Enhance image editing tests and functionality

- Added parameterized tests for image edit replacement to ensure alpha mode preservation.
- Refactored existing tests to utilize new image editing methods and improve clarity.
- Introduced new tests for image target functionality, ensuring proper handling of shared textures and context.
- Updated various tests to validate alpha mode handling across different scenarios.
- Improved undo/redo functionality in image operators to maintain state consistency.
- Added support for texture node actions, enhancing integration with Blender's node system.
- Ensured that image properties are preserved during operations and that invalid contexts are handled gracefully.

tests/anyimage/common/test_material_view_adaptation.py

@@ -115,7 +115,7 @@ def test_material_pixels_survive_pack_and_library_reload(color_data, tmp_path, e
     assert (restored.colorspace_settings.name, restored.alpha_mode) == selected
     np.testing.assert_allclose(images.image_pixels(restored), before, atol=1 / 255)
     edited = images.create_image_edit_result(restored, images.image_pixels(restored), (2, 1))
-    assert edited.alpha_mode == "PREMUL"
+    assert edited.alpha_mode == selected[1]
     np.testing.assert_allclose(images.image_pixels(edited), before, atol=1 / 255)
 
 
@@ -179,16 +179,16 @@ def test_new_material_uses_current_preference_and_preserves_existing(color_data,
         np.testing.assert_array_equal(images.image_pixels(image), pixels)
 
 
-def test_edit_results_keep_their_policy_with_adaptation_enabled(color_data, tmp_path):
+def test_edit_results_preserve_source_alpha_with_adaptation_enabled(color_data, tmp_path):
     source = bpy.data.images.new("Editing source", width=1, height=1, alpha=True)
     rgba = np.array([0.2, 0.4, 0.8, 0.25], dtype=np.float32)
     Image.fromarray(np.array([[[51, 102, 204, 64]]], dtype=np.uint8)).save(tmp_path / "image.0001.png")
     with patch.object(preferences, "addon_preferences", return_value=SimpleNamespace(adapt_material_to_view_transform=True)):
         edited = images.create_image_edit_result(source, rgba, (1, 1))
-        loaded = images.load_image_edit_result(SimpleNamespace(data=source), tmp_path)
+        loaded = images.load_image_edit_result(source, tmp_path)
     for result in (edited, loaded):
         assert result.colorspace_settings.name == "sRGB"
-        assert result.alpha_mode == "PREMUL"
+        assert result.alpha_mode == source.alpha_mode
         np.testing.assert_allclose(images.image_pixels(result), rgba, atol=1 / 255)
     assert source.colorspace_settings.name == "sRGB"
     assert source.alpha_mode == "STRAIGHT"