fix(forms): reset replacement sessions and preserve visible scroll

crates/oa-desktop/src/behavior/scenario/workspace.rs

@@ -1,7 +1,7 @@
 //! Scenario presentation. Layout/camera controls never construct model commands.
-use super::super::scenario_scroll;
+use super::super::{form_session, scenario_scroll};
 use super::*;
-use iced::widget::{Space, column, keyed_column, sensor};
+use iced::widget::{Space, column, sensor};
 
 pub(crate) const NAME_INPUT: &str = "scenario-form-name";
 
@@ -754,16 +754,13 @@ fn editor_panel<'a, R: iced::advanced::text::Renderer + 'a>(
     container(
         column![
             container(actions).id("scenario-actions").width(Fill),
-            keyed_column([(
+            form_session::reset_on_change(
                 session,
                 scrollable(fields)
                     .id("scenario-form")
                     .width(Fill)
-                    .height(Fill)
-                    .into(),
-            )])
-            .width(Fill)
-            .height(Fill),
+                    .height(Fill),
+            ),
         ]
         .spacing(6),
     )