Commits on Jan 20, 2022

1. Provide system clipboard handling API on Window …

   Clipboard handling is essential for system window handling and also is a
   complicated task to be implemented and handled properly. So abstracting
   this code into a windowing library like `winit` is the most sensible
   thing to do.
   
   While it could be offloaded to crates like copypasta[1] the result is
   always not good enough[2][3] and it also results in
   overengineering[4] (look at its codebase size and compare to what we've
   got in winit for Wayland and how much better the handling is done in
   winit).
   
   The new API is on the `Window` and is the following:
   
   ```rust
   pub fn set_clipboard_content<C: AsRef<[u8]> + 'static>(
       &self,
       content:
       C, mimes: HashSet<String>);
   
   pub fn request_clipboard_content(
       &self,
       mimes: HashSet<String>,
       metadata: Option<std::sync::Arc<ClipboardMetadata>>);
   ```
   
   And also on `WindowExtUnix` where added similar methods to get primary
   selection content (The one on middle mouse button).
   
   Working with clipboard is async and loading it is in resulted window
   event in `event::WindowEvent::ClipboardContent`.
   
   The use of metadata is due to provide ability to identify requested
   load from system's clipboard.
   
   [1] - https://github.com/alacritty/copypasta.
   [2] - alacritty/alacritty#3108
   [3] - alacritty/alacritty#3601
   [4] - https://github.com/Smithay/smithay-clipboard

   

   kchibisov committed Jan 20, 2022
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