winit: initial minibrowser (#29976)

* winit: add minibrowser feature that depends on egui{,-winit}

* winit: carve out some space at the top of headed windows

* winit: minimal toolbar and egui/winit integration (but no painting)

* winit: try to paint with egui_glow (doesn’t work yet)

* winit: add comment about toolbar size

* Add framebuffer object, set it as glow's target

* compositing: clear only the viewport, not the whole framebuffer

* plumb the actual size of the egui toolbar to webrender

* fix formatting

* winit: fix crash when fbo is zero

* winit: don’t bother binding the framebuffer object

* winit: remove unsafe and get toolbar_height

* winit: location field should reflect the current top-level url

* [NFC] winit: move Minibrowser out of App::run

* winit: clean up toolbar height code

* winit: make App own the Minibrowser if any

* winit: make the go button work

* winit:make the location field reflect the current top-level url

* winit: allow enabling minibrowser from command line

* winit: tell compositor to repaint WR and flush when we repaint

* winit: fix bug where location field edits would get overridden

* winit: borrow the minibrowser once in App::handle_events

* winit: address todo about viewport origin coordinates

* winit: fix some minor problems with comments and errors

* winit: update location field once per HistoryChanged event

* winit: rename Window::set_toolbar_size to set_toolbar_height

* winit: take toolbar height into account in hit testing

* winit: pass egui only relevant CursorMoved events

* winit: scratch that, coalesce minibrowser updates instead

* ensure both minibrowser and WR are repainted on every frame

* compositing: only skip framebuffer clear in external present mode

* winit: destroy egui glow Painter when shutting down

* winit: clean up and fix license lint

* fix duplicate versions lint by downgrading bytemuck_derive

was egui_glow ^0.22.0 (0.22.0)
→ egui/bytemuck ^0.22.0 (0.22.0)
→ epaint/bytemuck ^0.22.0 (0.22.0)
→ bytemuck ^1.7.2 (1.13.1)
→ bytemuck_derive ^1.4 (1.4.1)
→ syn ^2.0.1 (2.0.28)

now lock has bytemuck_derive 1.4.0
→ syn ^1.0.99 (1.0.103)

* fix duplicate versions lint by disabling egui-winit/links

(we don’t need support for hyperlinks in our use of egui)

* squelch duplicate versions lint by excluding clipboard-win

* winit: fix compile warnings

* winit: make gleam an optional dependency under /minibrowser

* winit: remove cargo feature, since it’s not really optional

* winit: extract Minibrowser and related code to separate module

* winit: remove unnecessary trailing comma

* winit: simplify the ServoUrl serialisation optimisation

---------

Co-authored-by: atbrakhi <atbrakhi@igalia.com>

servo-tidy.toml

@@ -79,6 +79,9 @@ packages = [
 
   # Temporarily duplicated until gleam can be upgrded.
   "uuid",
+
+  # winit port minibrowser (servo/servo#30049)
+  "clipboard-win",
 ]
 # Files that are ignored for all tidy and lint checks.
 files = [