Upstream pulled clipboard_x11 unconditionally on unix, which drags
x11rb + x11rb-protocol and ~500 symbols of X11 clipboard code into
every Wayland-only iced build. Add an x11 feature (default-on for
compat) that gates:
- the clipboard_x11 workspace dep (now optional)
- `pub use clipboard_x11 as x11` re-export
- the Clipboard::X11 enum variant
- every match arm that handles it
- the fallback branch in `unsafe fn connect` (returns a helpful
error when called with a non-Wayland display handle)
Wayland-only builds set `window_clipboard = { ..., default-features = false, features = ["wayland"] }` and skip the x11 backend entirely.
Update raw-window-handle to v0.5. This mainly consisted of using the
newly added RawDisplayHandle trait instead of the previously used
RawWindowHandle trait. For the Linux implementation, this also included
updating winit to v0.27
