IDE workbench

A code editor: a file tree in the start border opens files as tabs, modified tabs show a dot and ask before closing, a terminal and problems panel in a bottom border, a context menu per tab, an overflow select, and the layout saved between visits.

• Dockable.Borders
• typed data
• tab.add
• tab.select
• tab.set-data
• model.use veto
• model.subscribe
• toJSON
• LayoutValidationError
• AlertDialog
• ContextMenu
• Select
• localStorage