Fix dual output source z order

[aleksandr-voitenko]

Description

This fixes the following issue:

Steps:
- Add a new source in a single output mode
- Enable dual output

Expected results:
The latest source is present at the top of the sources list and rendered on top of other
sources for both vertical and horizontal canvases.

Actual results:
The latest source is present at the top of the sources list and rendered on top of other
sources for the horizontal canvas, but it is rendered behind other sources on the vertical canvas (see screenshot)

Details

When a source was added in single-output mode and Dual Output was subsequently enabled, the source remained top-most on the horizontal canvas but could render behind older sources on the vertical canvas.

Collections saved with this incorrect vertical order also retained the problem after restarting Desktop.

Even more details

Horizontal and vertical scene nodes share one scene-node list and are connected through sceneNodeMaps. Partner creation and single-to-dual conversion did not consistently preserve the horizontal z-order when constructing the vertical node block. Nested-folder reparenting could also reverse sibling order.

Changes

• Preserve source z-order when converting a single-output collection to Dual Output.
• Keep newly created source, copied-source, and folder partners correctly ordered for both active and inactive scenes.
• Preserve nested-folder sibling order during conversion.
• Validate mapped dual-output scenes when a collection is loaded.
• Rebuild the vertical node order from the authoritative horizontal order for valid existing scenes.
• Require a complete one-to-one node map with matching displays, node types, sources, and mirrored folder relationships before repairing.
• Leave malformed or incomplete scene graphs untouched and log a warning instead of guessing.
• Avoid changing node mappings while repairing persisted order.

[bundlemon]

BundleMon

Files added (4)

Status	Path	Size	Limits
✅	renderer.(hash).js	+10.53MB	-
✅	vendors~renderer.(hash).js	+4.67MB	-
✅	updater.js	+115.29KB	-
✅	guest-api.js	+40.23KB	-

Total files change +15.35MB

Final result: ✅

View report in BundleMon website ➡️

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Current branch size history