gui_toolkit 0.91.0

Added

• ui.lazy_pin, ui.lazy_pinned: the view stays on an item, a given distance into it, placed after each layout whatever grows around it; what the last layout found of it says when it has settled.
• ui.press_data: what a gesture keeps lives on its press: the zero T when the press began, the same while it lasts, gone when it ends by whatever way (release, its box gone, the user leaving the window). A press of the same box again, even in one batch of input, starts from zero.
• ui.window_clipboard_get, ui.window_clipboard_set: Build_Params' clipboard procedures for the system's clipboard of the build's window, so a program no longer needs a global to reach its window.
• platform.events_waiting: whether a window has something for its next poll_events, without waiting. A loop of several windows asks each before it sleeps, because the poll of one window of the thread takes the others' messages.
• host: a window as an object, above ui and render. host_open, host_frame (pace, input, resize, builds, picture, present), host_close, and hosts_wait / hosts_due / hosts_frame for several windows on one renderer. Hooks cover what a rich application's frame does of its own: params, input, builds (several in a frame: host_build), hold (no picture this frame), after_build, before_input, dragging, rest_frame. It keeps the orders that matter: input is read with the renderer given back, a step of a resize is that window's alone, buffers keep the monitor's size, and only the first window is paced. examples/hello and examples/todo use it; the way by hand is unchanged.
• render.surface_scope: surface_use until the end of the calling scope, so a frame on a second window cannot forget to go back.
• ui.view_limit, ui.view_reveal, ui.view_reveal_offset, ui.view_jump, ui.view_shift: the verbs of a scroll box's view, for code that wrote view_off, view_target and view_anim by hand. view_reveal says whether the target moved, so a caller decides on scrollbar_reveal itself; view_shift keeps a glide under way and leaves a target at the top there.

Changed

• A lazy column looks each item up once per build, in one map: an item's height is noted after the layout that placed it.
• Splitters, dialog grips, floating panel corners, range sliders: what their drag starts from is kept on the press (ui.press_data), not in the State's one drag payload. ui.drag_store and ui.drag_load stay, for gestures that read an earlier press (panes).
• render.Window_Target: what is one window's is now a struct of its own, included by using in Renderer and Surface, and Wgpu_Window on the WebGPU side; surface_use exchanges them whole, so a new window field needs no list. Field access is unchanged, except that Surface.gen and Surface.space_epoch are now Surface.swap_gen and Surface.swap_space, and Surface.wgpu_backing is a ^Wgpu_Window.
• A row taller than its view keeps its top: ui.list, menus, reorder_offset, the focus and the accessibility reveal now follow the rule ui.vlist had, instead of showing the row's bottom.
• A box's name and text: copied as they are at each build, without going through the formatter.

Fixed

• WebGPU second windows: a window's frame format now goes with it through surface_use, as its offscreen target does on Direct3D 11.
• Scrolling: dragging a scroll bar's thumb or stepping a long menu ends a glide under way, which could pull the view back for a frame; a ui.vlist whose rows moved during a glide no longer starts the glide over.