fix(bedit): restore the view when leaving the block editor

Entering the block editor reframes the camera on the block's own
geometry, but nothing remembered where the model view was — Save /
Discard returned to the layout with the camera still parked at the
editor's framing (#425). The session now captures the camera on entry
and both exits restore it exactly.

Co-Authored-By: Claude Fable 5 <[email protected]>

src/app/commands/inquiry.rs

@@ -385,6 +385,9 @@ impl OpenCADStudio {
                 self.push_undo_snapshot(i, "BEDIT");
 
                 let return_layout = self.tabs[i].scene.current_layout.clone();
+                // Capture the camera before the editor reframes it, so leaving
+                // the block editor returns the view exactly where it was (#425).
+                let return_camera = self.tabs[i].scene.camera.borrow().clone();
                 // A block editor renders in model style; switch to Model first so
                 // the paper-space code paths stay off, then scope to the block.
                 if return_layout != "Model" {
@@ -396,6 +399,7 @@ impl OpenCADStudio {
                     br_handle,
                     return_layout,
                     snapshot,
+                    return_camera,
                 });
 
                 self.tabs[i].scene.deselect_all();
@@ -426,6 +430,9 @@ impl OpenCADStudio {
                 self.tabs[i].scene.block_edit_block = None;
                 self.tabs[i].scene.deselect_all();
                 self.tabs[i].scene.set_current_layout(session.return_layout.clone());
+                // Return the view to where it was when BEDIT began (#425).
+                *self.tabs[i].scene.camera.borrow_mut() = session.return_camera.clone();
+                self.tabs[i].scene.camera_generation += 1;
                 self.tabs[i].scene.rebuild_derived_caches();
                 self.tabs[i].dirty = true;
                 self.command_line.push_output(&format!(
@@ -474,6 +481,9 @@ impl OpenCADStudio {
                 self.tabs[i].scene.block_edit_block = None;
                 self.tabs[i].scene.deselect_all();
                 self.tabs[i].scene.set_current_layout(session.return_layout.clone());
+                // Return the view to where it was when BEDIT began (#425).
+                *self.tabs[i].scene.camera.borrow_mut() = session.return_camera.clone();
+                self.tabs[i].scene.camera_generation += 1;
                 self.tabs[i].scene.rebuild_derived_caches();
                 self.tabs[i].dirty = true;
                 self.command_line.push_output(&format!(

src/modules/draw/modify/block_edit.rs

@@ -43,7 +43,7 @@ pub fn block_edit_tools() -> Vec<ToolDef> {
 // ── Session state (held in DocumentTab) ───────────────────────────────────
 
 /// Active BEDIT block-editor session. Lives in `DocumentTab::block_edit`.
-#[derive(Debug, Clone)]
+#[derive(Clone)]
 pub struct BlockEditSession {
     /// Name of the block being edited (also the space-tab label).
     pub block_name: String,
@@ -55,6 +55,9 @@ pub struct BlockEditSession {
     /// The block's block-local entities captured on entry, so Discard can
     /// restore the definition (structural Block/BlockEnd/AttDef excluded).
     pub snapshot: Vec<EntityType>,
+    /// Camera state of the space that was active when BEDIT began, restored
+    /// on Save/Discard so the view returns exactly where it was (#425).
+    pub return_camera: crate::scene::view::camera::Camera,
 }
 
 // ── BEDIT pick command ─────────────────────────────────────────────────────