Introduce explicit id field to Settings

... and use it to set the application id of the window on Unix systems, instead of relying on the title of the application.

glutin/src/application.rs

@@ -58,6 +58,7 @@ where
                 &application.title(),
                 application.mode(),
                 event_loop.primary_monitor(),
+                settings.id,
             )
             .with_menu(Some(conversion::menu(&application.menu())));
 

src/settings.rs

@@ -4,12 +4,18 @@ use crate::window;
 /// The settings of an application.
 #[derive(Debug, Clone)]
 pub struct Settings<Flags> {
+    /// The identifier of the application.
+    ///
+    /// If provided, this identifier may be used to identify the application or
+    /// communicate with it through the windowing system.
+    pub id: Option<String>,
+
     /// The window settings.
     ///
     /// They will be ignored on the Web.
     pub window: window::Settings,
 
-    /// The data needed to initialize an [`Application`].
+    /// The data needed to initialize the [`Application`].
     ///
     /// [`Application`]: crate::Application
     pub flags: Flags,
@@ -58,6 +64,7 @@ impl<Flags> Settings<Flags> {
 
         Self {
             flags,
+            id: default_settings.id,
             window: default_settings.window,
             default_font: default_settings.default_font,
             default_text_size: default_settings.default_text_size,
@@ -74,8 +81,9 @@ where
 {
     fn default() -> Self {
         Self {
-            flags: Default::default(),
+            id: None,
             window: Default::default(),
+            flags: Default::default(),
             default_font: Default::default(),
             default_text_size: 20,
             text_multithreading: false,
@@ -89,6 +97,7 @@ where
 impl<Flags> From<Settings<Flags>> for iced_winit::Settings<Flags> {
     fn from(settings: Settings<Flags>) -> iced_winit::Settings<Flags> {
         iced_winit::Settings {
+            id: settings.id,
             window: settings.window.into(),
             flags: settings.flags,
             exit_on_close_request: settings.exit_on_close_request,

winit/src/application.rs

@@ -152,6 +152,7 @@ where
             &application.title(),
             application.mode(),
             event_loop.primary_monitor(),
+            settings.id,
         )
         .with_menu(Some(conversion::menu(&application.menu())))
         .build(&event_loop)

winit/src/settings.rs

@@ -16,6 +16,12 @@ use winit::window::WindowBuilder;
 /// The settings of an application.
 #[derive(Debug, Clone, Default)]
 pub struct Settings<Flags> {
+    /// The identifier of the application.
+    ///
+    /// If provided, this identifier may be used to identify the application or
+    /// communicate with it through the windowing system.
+    pub id: Option<String>,
+
     /// The [`Window`] settings
     pub window: Window,
 
@@ -70,6 +76,7 @@ impl Window {
         title: &str,
         mode: Mode,
         primary_monitor: Option<MonitorHandle>,
+        _id: Option<String>,
     ) -> WindowBuilder {
         let mut window_builder = WindowBuilder::new();
 
@@ -112,7 +119,10 @@ impl Window {
         ))]
         {
             use ::winit::platform::unix::WindowBuilderExtUnix;
-            window_builder = window_builder.with_app_id(title.to_string());
+
+            if let Some(id) = _id {
+                window_builder = window_builder.with_app_id(id);
+            }
         }
 
         #[cfg(target_os = "windows")]
@@ -122,6 +132,7 @@ impl Window {
             if let Some(parent) = self.platform_specific.parent {
                 window_builder = window_builder.with_parent_window(parent);
             }
+
             window_builder = window_builder
                 .with_drag_and_drop(self.platform_specific.drag_and_drop);
         }