Each engine window is drawn in its own native window through craft-window's
immediate-viewport driver (desktop only; the web app keeps one window). The
root viewport shows one window and adopts another when its window closes.
- WindowUi: the cell draft, text-box draft, dialog, Backstage, message,
toast, notice, grid state, name box, key tips, selected chart, Tab run and
edit mode are per window. SheetApp's fields hold the active window's; the
others are parked and swapped in when a window is drawn or activated, and
after any command that switched windows.
- Session::show_window makes a window current for drawing without counting
as an activation.
- The ribbon in each window acts on it; menu bar commands and scripts go to
the window focused last. Leaving a window enters its draft as Enter would.
- A window's close button runs window.close: one of several windows on a
workbook closes without asking, a workbook's last asks when unsaved.
SheetApp::request_quit (macOS Quit item, Dock quit) asks about each unsaved
workbook in its window; Cancel stops. Save Changes answers moved to
SheetApp::answer_save_changes.
- The last window closed quits on Windows and Linux; macOS hides the root
and keeps running until New or Open.
- Fonts are bound for every open workbook, since each may be showing.
craft-window is pinned to the aiongg/craft-libs window-list branch until it
merges into storytold/craft-libs.
Session keeps a window list (stable ids, per-window selection, active sheet
and per-sheet selections swapped into the workbook without dirtying it)
in place of the index-based hidden list and the copying New Window.
Titles read Name:1 / Name:2 for a workbook with several windows.
File > Close closes one window of several; window.close, window.list and
window ids for window.activate, view.switchWindows, view.hideWindow and
view.unhideWindow. Control channel and MCP tools take window/doc ids;
scroll positions and cell drafts belong to their window.
aiongg