src/__init__.py tests/: fix bug in Document.set_layer().

We need to use mupdf.pdf_array_push(), not mupdf.pdf_array_push_drop().

Addresses #3180.

Author: julian-smith-artifex-com

src/__init__.py

@@ -17437,7 +17437,7 @@ def JM_set_ocg_arrays_imp(arr, list_):
             # Not found.
             continue
         obj = mupdf.pdf_new_indirect(pdf, xref, 0)
-        mupdf.pdf_array_push_drop(arr, obj)
+        mupdf.pdf_array_push(arr, obj)
 
 
 def JM_set_resource_property(ref, name, xref):

tests/test_optional_content.py

@@ -72,3 +72,68 @@ def test_3143():
     set1 = set([p["layer"] for p in page.get_drawings()])
     set2 = set([b[2] for b in page.get_bboxlog(layers=True)])
     assert set0 == set1 == set2
+
+
+def test_3180():
+    doc = fitz.open()
+    page = doc.new_page()
+
+    # Define the items for the combo box
+    combo_items = ['first', 'second', 'third']
+
+    # Create a combo box field
+    combo_box = fitz.Widget()  # create a new widget
+    combo_box.field_type = fitz.PDF_WIDGET_TYPE_COMBOBOX
+    combo_box.field_name = "myComboBox"
+    combo_box.field_value = combo_items[0]
+    combo_box.choice_values = combo_items
+    combo_box.rect = fitz.Rect(50, 50, 200, 75)  # position of the combo box
+    combo_box.script_change = """
+    var value = event.value;
+    app.alert('You selected: ' + value);
+
+    //var group_id = optional_content_group_ids[value];
+
+    """
+
+    # Insert the combo box into the page
+    # https://pymupdf.readthedocs.io/en/latest/page.html#Page.add_widget
+    page.add_widget(combo_box)
+
+    # Create optional content groups
+    # https://github.com/pymupdf/PyMuPDF-Utilities/blob/master/jupyter-notebooks/optional-content.ipynb
+
+
+    # Load images and create OCGs for each
+    optional_content_group_ids = {}
+    for i, item in enumerate(combo_items):
+        optional_content_group_id = doc.add_ocg(item, on=False)
+        optional_content_group_ids[item] = optional_content_group_id
+        rect = fitz.Rect(50, 100, 250, 300)
+        image_file_name = f'{item}.png'
+        # xref = page.insert_image(
+        #    rect,
+        #    filename=image_file_name,
+        #    oc=optional_content_group_id,
+        # )
+
+
+    first_id = optional_content_group_ids['first']
+    second_id = optional_content_group_ids['second']
+    third_id = optional_content_group_ids['third']
+
+    # https://pymupdf.readthedocs.io/en/latest/document.html#Document.set_layer
+
+
+    doc.set_layer(-1, basestate="OFF")
+    layers = doc.get_layer()
+    doc.set_layer(config=-1, on=[first_id])
+
+    # https://pymupdf.readthedocs.io/en/latest/document.html#Document.set_layer_ui_config
+    # configs = doc.layer_ui_configs()
+    # doc.set_layer_ui_config(0, fitz.PDF_OC_ON)
+    # doc.set_layer_ui_config('third', action=2)
+
+    # Save the PDF
+    doc.save(os.path.abspath(f'{__file__}/../../tests/test_3180.pdf'))
+    doc.close()