IDE workbench

A code editor: a file tree in a left 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
• Actions.addTab
• Actions.selectTab
• updateNodeAttributes
• onAction veto
• AlertDialog
• ContextMenu
• Select
• localStorage