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_empty_image_edits.py

@@ -33,6 +33,27 @@ def edit_result(source):
     )
 
 
+@pytest.mark.parametrize("alpha_mode", ["STRAIGHT", "PREMUL", "CHANNEL_PACKED", "NONE"])
+@pytest.mark.parametrize("shared", [False, True])
+@pytest.mark.parametrize("entry", ["pixels", "image.", "upscale."])
+def test_image_edit_replacement_preserves_alpha_mode(source, tmp_path, alpha_mode, shared, entry):
+    original = source.data
+    original.alpha_mode = alpha_mode
+    if shared:
+        other = create_empty("Other", original)
+    if entry == "pixels":
+        result = edit_result(source)
+    else:
+        Image.new("RGBA", (4, 3), (100, 150, 200, 128)).save(tmp_path / f"{entry}0001.png")
+        result = images.load_image_edit_result(original, tmp_path, frame_prefix=entry)
+    assert result.alpha_mode == alpha_mode
+    images.replace_empty_image(source, result)
+    assert source.data.alpha_mode == alpha_mode
+    assert (source.data == original) == (not shared)
+    if shared:
+        assert other.data == original and original.alpha_mode == alpha_mode
+
+
 @pytest.mark.parametrize("sharing", ["visible", "hidden", "other_scene"])
 def test_shared_edit_preserves_other_empty(source, sharing):
     original = source.data
@@ -179,7 +200,7 @@ def test_animated_result_preserves_id_and_reopens(source, tmp_path):
     for index in (1, 2):
         Image.new("RGBA", (4, 3), (index * 80, 100, 50, 255)).save(tmp_path / f"image.{index:04d}.png")
     original.source = "SEQUENCE"
-    result = images.load_image_edit_result(source, tmp_path)
+    result = images.load_image_edit_result(source.data, tmp_path)
     expected_path = result.filepath_raw
     expected_packed = bytes(result.packed_file.data) if result.packed_file else None
     final = images.replace_empty_image(source, result)