Adding projects to a workspace took one folder at a time. Choosing a folder that is not itself a project now scans below it, up to four levels and a shared entry budget, without following symlinks or descending into a project and skipping dependency, output and hidden directories. The projects found appear in a checklist with linked ones disabled; a folder with none is added as before. The scan is cancellable and runs in both the create and manage dialogs.
Fixes#2102
Project windows only joined a tab group when merged explicitly or restored at startup; the macOS "Prefer tabs when opening documents" setting was never read, so opening another project or a workspace always created a separate window.
New project windows now follow that preference: with Always they join the active project window's tab group (forming one if needed) and are selected; with In Full Screen they do so only while the active window is full screen; with Manually they stay separate. This covers every path that creates a project window — Open, recent projects, workspaces, drag and drop, and opening from the command line or Finder — while LightEdit windows and restored groups keep their behaviour. New Workspace now opens through the same Open project in policy as Open Workspace, and a race when toggling full screen during the join is fixed.
Fixes#678
Workspaces open several local project folders in one IDE session (File › New / Open / Manage Workspace…, or Attach when opening a project, which creates a workspace automatically for a plain project window). Member folders are the Project view roots and take part in indexing, Find in Files, Git, language servers, run configurations and builds; agent tasks choose which member they work in. Window › Merge All Project Windows groups project windows into one window with project tabs (switch, reorder, close, move to a new window), restored on reopen.
Closes#241Closes#198Closes#286
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