Support FILEMANAGER classic widget in MDL page creation

[engalar]

Description

MDL cannot create a Forms$FileManager widget. This widget is essential for file upload functionality (e.g., CSV import, document upload) in Mendix pages.

Root Cause

MDL supports classic widgets via hardcoded shorthand keywords (TEXTBOX, TEXTAREA, CHECKBOX, DATEPICKER, etc.). Forms$FileManager is not in this list. The PLUGGABLEWIDGET syntax cannot create classic widgets because they don't have .mpk definitions.

Steps to Reproduce

-- None of these work:

-- Attempt 1: PLUGGABLEWIDGET
ALTER PAGE Module.Page {
  INSERT AFTER someWidget {
    PLUGGABLEWIDGET 'Forms\$FileManager' fileManager1
  }
};
-- Error: no definition for widget Forms$FileManager

-- Attempt 2: CUSTOMWIDGET
ALTER PAGE Module.Page {
  INSERT AFTER someWidget {
    CUSTOMWIDGET fileManager1 (WidgetType: 'Forms\$FileManager')
  }
};
-- Error: no definition for widget Forms$FileManager

Expected Behavior

Support FILEMANAGER as an MDL shorthand keyword, similar to TEXTBOX/TEXTAREA:

CREATE PAGE Module.Upload (
  Title: 'Upload File',
  Layout: Atlas_Core.PopupLayout,
  Params: { \$File: System.FileDocument }
) {
  DATAVIEW dv (DataSource: \$File) {
    FILEMANAGER fileManager1 (MaxFileSize: 10, AllowedExtensions: 'csv,xlsx')
    FOOTER footer1 {
      ACTIONBUTTON btnSave (Caption: 'Upload', Action: SAVE_CHANGES, ButtonStyle: Primary)
    }
  }
}

Impact

File upload is a core UI pattern. Without FILEMANAGER support, any page that needs file upload requires Studio Pro manual intervention, breaking the AI-assisted development workflow.

Workaround

Currently none via MDL. Must add FileManager widget manually in Studio Pro.

Evidence

DESCRIBE PAGE can read the widget:

-- Forms\$FileManager (fileManager1)

But cannot create or replace it — the classic widget shorthand list is hardcoded and doesn't include FileManager.

Other Classic Widgets That May Be Missing

Worth auditing: Forms$FileManager, Forms$ImageViewer, Forms$ImageUploader, Forms$ReferenceSelector, Forms$ReferenceSetSelector, Forms$InputReferenceSetSelector.

[github-actions]

Issue Triage

Summary:
The issue requests adding a FILEMANAGER shorthand keyword to MDL so that the classic Forms$FileManager widget can be created directly in MXCLI page scripts.

Checklist for feature request:

• ✅ Use case – explains why file upload support is needed and the impact on AI‑assisted workflow.
• ✅ Proposed syntax or behavior – shows the desired FILEMANAGER keyword usage in MDL.
• ❌ Mendix version relevance – not specified (is this needed for all Mendix versions or only certain ones?).

What’s missing:
Please let us know which Mendix version(s) you are targeting with this feature (e.g., 9.x, 10.x, or all versions). If the request applies across all supported versions, a brief note to that effect would be helpful.

Thank you for the detailed request! Once we have the version information, we can consider it complete.

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