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1e6ca81899
AccessKit asks for focus by node id, and `Focus::interested_in_focus` only picks the request up once the widget itself runs. Everything that reads the focus before the widget — styling it, for one — therefore saw the old focus, so a text edit was styled unfocused in the very pass it got focused, and lost its focus ring for a frame. AccessKit names the widget by the node id it read from the last tree we sent, so the widget has been here before and is in `focus_widgets_cache`: `begin_pass` can hand out the focus right away, the same way a `request_focus` from the last pass is handed out. Memory then holds the focus before any widget runs, and `Ui::widget_style` needs to know nothing about focus at all. For the same reason the request never has to outlive the pass it arrives in — a widget that has not run yet cannot have been named by it — so the pending `id_requested_by_accesskit` field becomes a local. The four `text_edit_*` snapshots gain a caret along with the ring, because the field is now focused for real in that pass rather than a pass later. Also drops `fallback_gap` from `TextEdit`, which has no `gap` of its own to defer to, and moves the `DragValue` `HasClasses` impl above its test module.
GUI implementation
This is the core library crate egui. It is fully platform independent without any backend. You give the egui library input each frame (mouse pos etc), and it outputs a triangle mesh for you to paint.