Propagate error from EventLoop creation

Inner panics could make it hard to trouble shoot the issues and for some
users it's not desirable.

The inner panics were left only when they are used to `assert!` during
development.

This reverts commit 9f91bc413fe20618bd7090829832bb074aab15c3 which
reverted the original patch which was merged without a proper review.

Fixes: #500.

src/platform_impl/linux/wayland/mod.rs

@@ -2,10 +2,14 @@
 
 //! Winit's Wayland backend.
 
-use sctk::reexports::client::protocol::wl_surface::WlSurface;
-use sctk::reexports::client::Proxy;
+use std::fmt::Display;
+use std::sync::Arc;
 
-pub use crate::platform_impl::platform::WindowId;
+use sctk::reexports::client::globals::{BindError, GlobalError};
+use sctk::reexports::client::protocol::wl_surface::WlSurface;
+use sctk::reexports::client::{self, ConnectError, DispatchError, Proxy};
+
+pub use crate::platform_impl::platform::{OsError, WindowId};
 pub use event_loop::{EventLoop, EventLoopProxy, EventLoopWindowTarget};
 pub use output::{MonitorHandle, VideoMode};
 pub use window::Window;
@@ -17,6 +21,46 @@ mod state;
 mod types;
 mod window;
 
+#[derive(Debug)]
+pub enum WaylandError {
+    /// Error connecting to the socket.
+    Connection(ConnectError),
+
+    /// Error binding the global.
+    Global(GlobalError),
+
+    // Bind error.
+    Bind(BindError),
+
+    /// Error during the dispatching the event queue.
+    Dispatch(DispatchError),
+
+    /// Calloop error.
+    Calloop(calloop::Error),
+
+    /// Wayland
+    Wire(client::backend::WaylandError),
+}
+
+impl Display for WaylandError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            WaylandError::Connection(error) => error.fmt(f),
+            WaylandError::Global(error) => error.fmt(f),
+            WaylandError::Bind(error) => error.fmt(f),
+            WaylandError::Dispatch(error) => error.fmt(f),
+            WaylandError::Calloop(error) => error.fmt(f),
+            WaylandError::Wire(error) => error.fmt(f),
+        }
+    }
+}
+
+impl From<WaylandError> for OsError {
+    fn from(value: WaylandError) -> Self {
+        Self::WaylandError(Arc::new(value))
+    }
+}
+
 /// Dummy device id, since Wayland doesn't have device events.
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct DeviceId;