GTK+ 4 checklist

• GDK
  • Drop subwindows - mostly done
  • root window removal

  • GdkWindowSubsurface treatment

  • gdk_window_move()/get_position()
• Widget-level work
  • Let widgets have children - DONE
  • Replace gadgets by widgets - DONE
  • Picking - DONE
  • Coordinate system cleanup - DONE, needs documentation
  • We have a lot more CSS invalidations now and they are slow.
    • Tons of state changes due to automatic prelight and focus
    • We look at the style a lot more, e.g. in measure and gtk_widget_size_allocate

    • Since GdkWindow is gone we recompute the style for every row/cell/column in GtkTreeview every frame

• Input handling - partially done

  • Make GdkEvent union/structs private (wip)

  • Turn GtkWidgetClass vmethod/GtkEventController relation upside down. (wip)

  • Missing useful GtkGestures/GtkEventControllers: Stylus, Scroll, Key (wip)

  • Make event handling frame-sync. Deprecate gdk_device_get_history(), add API to get uncoalesced events.

  • Down with GdkDeviceManager, needs per-backend work

• GSK / Render nodes
  • Vulkan - DONE
  • GL - all fallback

  • Text rendering - need texture atlas for fonts. We want to reuse cogl-pango code as far as possible. gicmo is looking at this: