[py] warn about upcoming changes to move_to_element_with_offset behavior

Author: titusfortner

py/selenium/webdriver/common/actions/mouse_button.py

@@ -21,3 +21,6 @@ class MouseButton:
     LEFT = 0
     MIDDLE = 1
     RIGHT = 2
+    BACK = 3
+    FORWARD = 4
+

py/selenium/webdriver/common/actions/pointer_actions.py

@@ -14,6 +14,8 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+import warnings
+
 from . import interaction
 
 from .interaction import Interaction
@@ -57,6 +59,13 @@ def move_to(self, element, x=0, y=0, width=None, height=None, pressure=None,
             raise AttributeError("move_to requires a WebElement")
 
         if x or y:
+            warnings.warn(
+                "move_to_element_with_offset() currently tries to use the top left corner "
+                "of the element as the origin; in Selenium 4.3 it will use the in-view "
+                "center point of the element as the origin.",
+                DeprecationWarning,
+                stacklevel=2
+            )
             el_rect = element.rect
             left_offset = el_rect['width'] / 2
             top_offset = el_rect['height'] / 2