bug(developer): rename and delete a layer does not remove it in the Code View of Touch Layout

[Meng-Heng]

Describe the bug

There's no error, only warnings:

xyz.kmn - warn KM02091: Key "K_SHIFT" on platform "phone", layer "shift" (row:3 col:1), references a missing layer "def"
xyz.kmn - warn KM02091: Key "K_LOWER" on platform "phone", layer "numeric" (row:4 col:1), references a missing layer "def"

Once unchecked the "Treat compiler hints and warnings as errors", the project runs fine.

Reproduce the bug

1. Open a keyboard project
2. Go to Touch Layout tab
3. In Design view, rename a layer from default to def
4. Save & Compile
5. The name changed

"id": 4,
            "key": [
              {
                "id": "K_LOWER",
                "text": "*abc*",
                "width": 140,
                "sp": 1,
                "nextlayer": "defg"
              },

6. Remove the def layer, the name remains in the Code view

Expected behavior

the layer name should be removed in both views.

Related issues

#15188

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Keyman version

19.0.174

Operating system

Windows 11 Parallels

Device

macOS

Target application

No response

Browser

No response

Keyboard name

#15215

Keyboard version

No response

Language name

No response

Additional context

How to workaround this issue:

1. Add a layer
2. Rename to the previously deleted name
3. Rename it to something else will solve this issue.