Feature: author Forms$SidebarToggleButton so a copied Atlas layout (describe layout → create layout) keeps its responsive sidebar toggle

[MohamedElNady]

Use case

A common first step for a branded app shell is copying Atlas_Core.Atlas_Default into your own module: describe layout, then create layout under a new name, then customise. In v0.24.0 the describe output says so itself:

$ mxcli -p Repro.mpr -c "describe layout Atlas_Core.Atlas_Default"
...
-- Forms$SidebarToggleButton (sidebarToggle3)  -- NOT re-executable: mxcli cannot author this widget, so re-running this script would drop it

Atlas's responsive sidebar (slide-in navigation on phones and tablets) depends on that button. The copied layout therefore loses mobile navigation, and nothing warns at exec time.

Proposed behaviour

• A widget keyword, for example sidebartoggle sidebarToggle3 (Caption: '', Icon: …, Class: 'toggle-btn', RenderMode: Button), which describe layout emits instead of the comment. Its properties are those of Forms$SidebarToggleButton (caption, icon, button style, render mode).
• Until then, exec of a layout containing that comment could print a warning that the copy has no sidebar toggle.

Environment

mxcli v0.24.0; Mendix 11.14.0 blank project (Atlas_Core 4.1.3); the same widget is in current Atlas versions.

[github-actions]

Issue Triage

Summary:
The request is to enable mxcli to author the Forms$SidebarToggleButton widget (or at least warn when it’s missing) so that copying an Atlas layout via describe layout → create layout preserves the responsive sidebar toggle.

Checklist for feature request

Required field	Present?	Details
Use case – why the feature is needed	✅	Describes the common workflow of copying Atlas_Core.Atlas_Default and losing the sidebar toggle.
Proposed syntax or behavior (if applicable)	✅	Suggests emitting a widget keyword for Forms$SidebarToggleButton or printing a warning at exec time.
Mendix version relevance (if version‑specific)	✅	Notes mxcli v0.24.0, Mendix 11.14.0 blank project (Atlas_Core 4.1.3) and that the widget exists in current Atlas versions.

Conclusion:
All required information for a feature request is present. Thank you for the clear and detailed issue!

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