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aiongg
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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.