DYN-9321: Prevent adding CBN into collapsed annotation on double-click - #17282

Purpose

This is a small PR to address DYN-9321

Fixes a bug where double-clicking a collapsed annotation would create a visible CodeBlock node that nevertheless became part of the collapsed group's model (causing layout/visibility/boundary glitches).

Now double-clicking an annotation still creates a CodeBlock node, but the node is only added to the annotation when the annotation is expanded (aligned with drag-to-group behavior).

Changes

• WorkspaceViewModel.HandleAnnotationDoubleClick ensure newly created node is added to the annotation only when annotation.IsExpanded
• regression test

Before:

After:

Declarations

Check these if you believe they are true

• Is documented according to the standards
• The level of testing this PR includes is appropriate
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.

Release Notes

Prevent newly created Code Block nodes from being added into collapsed groups when double-clicking the group.

Reviewers

@DynamoDS/eidos
@jasonstratton
@johnpierson

FYIs

@dnenov