Added AlertDialog.inset_padding property (#1899)

* insetPadding property of AlertDialog

* fixed error with nullable padding

package/lib/src/controls/alert_dialog.dart

@@ -65,6 +65,8 @@ class _AlertDialogControlState extends State<AlertDialogControl> {
       actionsPadding: parseEdgeInsets(widget.control, "actionsPadding"),
       actionsAlignment: actionsAlignment,
       shape: parseOutlinedBorder(widget.control, "shape"),
+      insetPadding: parseEdgeInsets(widget.control, "insetPadding") ??
+          const EdgeInsets.symmetric(horizontal: 40.0, vertical: 24.0),
     );
   }
 

sdk/python/packages/flet-core/src/flet_core/alert_dialog.py

@@ -78,6 +78,7 @@ def __init__(
         actions_padding: PaddingValue = None,
         actions_alignment: MainAxisAlignment = MainAxisAlignment.NONE,
         shape: Optional[OutlinedBorder] = None,
+        inset_padding: PaddingValue = None,
         on_dismiss=None,
     ):
 
@@ -103,6 +104,7 @@ def __init__(
         self.actions_padding = actions_padding
         self.actions_alignment = actions_alignment
         self.shape = shape
+        self.inset_padding = inset_padding
         self.on_dismiss = on_dismiss
 
     def _get_control_name(self):
@@ -114,6 +116,7 @@ def _before_build_command(self):
         self._set_attr_json("contentPadding", self.__content_padding)
         self._set_attr_json("titlePadding", self.__title_padding)
         self._set_attr_json("shape", self.__shape)
+        self._set_attr_json("insetPadding", self.__inset_padding)
 
     def _get_children(self):
         children = []
@@ -225,6 +228,15 @@ def shape(self) -> Optional[OutlinedBorder]:
     def shape(self, value: Optional[OutlinedBorder]):
         self.__shape = value
 
+    # inset_padding
+    @property
+    def inset_padding(self) -> PaddingValue:
+        return self.__inset_padding
+
+    @inset_padding.setter
+    def inset_padding(self, value: PaddingValue):
+        self.__inset_padding = value
+
     # on_dismiss
     @property
     def on_dismiss(self):