On X11, extract event handlers

Make code more clear wrt explicit returns during event handling,
which may lead to skipped IME event handling.

src/platform_impl/linux/mod.rs

@@ -940,10 +940,12 @@ impl EventLoopWindowTarget {
         }
     }
 
+    #[allow(dead_code)]
     fn set_exit_code(&self, code: i32) {
         x11_or_wayland!(match self; Self(evlp) => evlp.set_exit_code(code))
     }
 
+    #[allow(dead_code)]
     fn exit_code(&self) -> Option<i32> {
         x11_or_wayland!(match self; Self(evlp) => evlp.exit_code())
     }

src/platform_impl/linux/x11/atoms.rs

@@ -6,15 +6,15 @@ macro_rules! atom_manager {
     ($($name:ident $(:$lit:literal)?),*) => {
         x11rb::atom_manager! {
             /// The atoms used by `winit`
-            pub(crate) Atoms: AtomsCookie {
+            pub Atoms: AtomsCookie {
                 $($name $(:$lit)?,)*
             }
         }
 
         /// Indices into the `Atoms` struct.
         #[derive(Copy, Clone, Debug)]
         #[allow(non_camel_case_types)]
-        pub(crate) enum AtomName {
+        pub enum AtomName {
             $($name,)*
         }
 

src/platform_impl/linux/x11/dnd.rs

@@ -41,7 +41,7 @@ impl From<io::Error> for DndDataParseError {
     }
 }
 
-pub(crate) struct Dnd {
+pub struct Dnd {
     xconn: Arc<XConnection>,
     // Populated by XdndEnter event handler
     pub version: Option<c_long>,