Bonsai: keep "disable selection" objects visible when activating a drawing (#7681)

tool.Blender.isolate_objects keeps objects visible by selecting the
intended set and then hiding everything unselected via
hide_view_set(unselected=True). Blender refuses to select an object whose
"disable selection" (hide_select) is enabled, so such an object is treated
as unselected and hidden. Activating a drawing therefore turned off any
object that had disable-selection on.

Temporarily clear hide_select on the target objects so they can be
selected (and thus kept visible), then restore it. The clear/restore is
wrapped in try/finally so hide_select is always restored even if the hide
operator raises.

Verified in headless Blender with real objects: an object with
hide_select set is hidden by the pre-fix logic and stays visible with the
fix, hide_select is preserved, and unrelated objects are still hidden.

Generated with the assistance of an AI coding tool.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/bonsai/bonsai/tool/blender.py

@@ -2315,10 +2315,23 @@ class Blender(bonsai.core.tool.Blender):
             bpy.ops.object.hide_view_clear(select=False)
 
         bpy.ops.object.select_all(action="DESELECT")
-        for obj in objs:
+        # Objects with "disable selection" (hide_select) enabled cannot be
-            obj.select_set(True)
+        # selected, so they would be treated as unselected and hidden by
-        with bpy.context.temp_override(**override):
+        # hide_view_set(unselected=True) below - see #7681. Temporarily clear
-            bpy.ops.object.hide_view_set(unselected=True)
+        # hide_select so they can be selected (and thus kept visible), then
+        # restore it afterwards.
+        unselectable = []
+        try:
+            for obj in objs:
+                if obj.hide_select:
+                    obj.hide_select = False
+                    unselectable.append(obj)
+                obj.select_set(True)
+            with bpy.context.temp_override(**override):
+                bpy.ops.object.hide_view_set(unselected=True)
+        finally:
+            for obj in unselectable:
+                obj.hide_select = True
 
         bpy.ops.object.select_all(action="DESELECT")
         for name in previously_selected: