Add Window::set_ime_purpose

This adds a way to set the purpose for the IME input, implemented
only on Wayland for now.

src/platform_impl/ios/window.rs

@@ -27,8 +27,8 @@ use crate::{
         monitor, EventLoopWindowTarget, Fullscreen, MonitorHandle,
     },
     window::{
-        CursorGrabMode, CursorIcon, ResizeDirection, Theme, UserAttentionType, WindowAttributes,
-        WindowButtons, WindowId as RootWindowId, WindowLevel,
+        CursorGrabMode, CursorIcon, ImePurpose, ResizeDirection, Theme, UserAttentionType,
+        WindowAttributes, WindowButtons, WindowId as RootWindowId, WindowLevel,
     },
 };
 
@@ -303,6 +303,10 @@ impl Inner {
         warn!("`Window::set_ime_allowed` is ignored on iOS")
     }
 
+    pub fn set_ime_purpose(&self, _purpose: ImePurpose) {
+        warn!("`Window::set_ime_allowed` is ignored on iOS")
+    }
+
     pub fn focus_window(&self) {
         warn!("`Window::set_focus` is ignored on iOS")
     }