fix error on odoo 19

__manifest__.py

@@ -15,11 +15,6 @@ This module extends the Odoo Sign module to allow users to upload images as a fi
         'data/sign_item_type_data.xml',
     ],
     'assets': {
-        'web.assets_frontend': [
-            'sign_image_field/static/src/css/sign_image_field.css',
-            'sign_image_field/static/src/js/sign_image_upload.js',
-            'sign_image_field/static/src/xml/sign_items_image.xml',
-        ],
         'web.assets_backend': [
              'sign_image_field/static/src/css/sign_image_field.css',
              'sign_image_field/static/src/js/sign_image_upload.js',

models/sign_item_type.py

@@ -8,3 +8,9 @@ class SignItemType(models.Model):
     _inherit = "sign.item.type"
 
     item_type = fields.Selection(selection_add=[('image', "Image")], ondelete={'image': 'cascade'})
+
+    def _compute_dimensions(self):
+        super(SignItemType, self.filtered(lambda r: r.item_type != 'image'))._compute_dimensions()
+        for record in self.filtered(lambda r: r.item_type == 'image'):
+            record.default_width = 0.2
+            record.default_height = 0.05

tests/__init__.py

@@ -0,0 +1 @@
+from . import test_sign_item_type

tests/test_sign_item_type.py

@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+from odoo.tests.common import TransactionCase
+
+class TestSignItemType(TransactionCase):
+
+    def test_image_item_type_dimensions(self):
+        """ Test that creating a sign item type of type 'image' computes dimensions correctly without error """
+        image_type = self.env['sign.item.type'].create({
+            'name': 'Test Image Field',
+            'item_type': 'image',
+            'field_size': 'regular_text', # Should be ignored for non-text types but required
+        })
+        
+        # Trigger computation if not already done
+        image_type._compute_dimensions()
+
+        self.assertEqual(image_type.default_width, 0.2, "Default width for image should be 0.2")
+        self.assertEqual(image_type.default_height, 0.05, "Default height for image should be 0.05")
+
+    def test_other_item_type_dimensions(self):
+        """ Ensure standard types still work as expected """
+        signature_type = self.env['sign.item.type'].create({
+            'name': 'Test Signature',
+            'item_type': 'signature',
+            'field_size': 'regular_text',
+        })
+        signature_type._compute_dimensions() # Should rely on super
+        
+        # Values from standard Odoo: 'signature': [0.2, 0.05]
+        self.assertEqual(signature_type.default_width, 0.2)
+        self.assertEqual(signature_type.default_height, 0.05)