Remove unused callbacks (#11410)

This PR follows up #11314 (which removes some deprecated `callback`s)
removes the corresponding implements.

Release Notes:

- N/A

crates/gpui/src/platform/linux/platform.rs

@@ -35,9 +35,9 @@ use crate::platform::linux::wayland::WaylandClient;
 use crate::{
     px, Action, AnyWindowHandle, BackgroundExecutor, ClipboardItem, CosmicTextSystem, CursorStyle,
     DisplayId, ForegroundExecutor, Keymap, Keystroke, LinuxDispatcher, Menu, Modifiers,
-    PathPromptOptions, Pixels, Platform, PlatformDisplay, PlatformInput, PlatformInputHandler,
-    PlatformTextSystem, PlatformWindow, Point, PromptLevel, Result, SemanticVersion, Size, Task,
-    WindowAppearance, WindowOptions, WindowParams,
+    PathPromptOptions, Pixels, Platform, PlatformDisplay, PlatformInputHandler, PlatformTextSystem,
+    PlatformWindow, Point, PromptLevel, Result, SemanticVersion, Size, Task, WindowAppearance,
+    WindowOptions, WindowParams,
 };
 
 use super::x11::X11Client;
@@ -72,11 +72,8 @@ pub trait LinuxClient {
 #[derive(Default)]
 pub(crate) struct PlatformHandlers {
     pub(crate) open_urls: Option<Box<dyn FnMut(Vec<String>)>>,
-    pub(crate) become_active: Option<Box<dyn FnMut()>>,
-    pub(crate) resign_active: Option<Box<dyn FnMut()>>,
     pub(crate) quit: Option<Box<dyn FnMut()>>,
     pub(crate) reopen: Option<Box<dyn FnMut()>>,
-    pub(crate) event: Option<Box<dyn FnMut(PlatformInput) -> bool>>,
     pub(crate) app_menu_action: Option<Box<dyn FnMut(&dyn Action)>>,
     pub(crate) will_open_app_menu: Option<Box<dyn FnMut()>>,
     pub(crate) validate_app_menu_command: Option<Box<dyn FnMut(&dyn Action) -> bool>>,

crates/gpui/src/platform/linux/wayland/window.rs

@@ -37,7 +37,6 @@ pub(crate) struct Callbacks {
     input: Option<Box<dyn FnMut(crate::PlatformInput) -> crate::DispatchEventResult>>,
     active_status_change: Option<Box<dyn FnMut(bool)>>,
     resize: Option<Box<dyn FnMut(Size<Pixels>, f32)>>,
-    fullscreen: Option<Box<dyn FnMut(bool)>>,
     moved: Option<Box<dyn FnMut()>>,
     should_close: Option<Box<dyn FnMut() -> bool>>,
     close: Option<Box<dyn FnOnce()>>,
@@ -480,11 +479,6 @@ impl WaylandWindowStatePtr {
     pub fn set_fullscreen(&self, fullscreen: bool) {
         let mut state = self.state.borrow_mut();
         state.fullscreen = fullscreen;
-
-        let mut callbacks = self.callbacks.borrow_mut();
-        if let Some(ref mut fun) = callbacks.fullscreen {
-            fun(fullscreen)
-        }
     }
 
     /// Notifies the window of the state of the decorations.

crates/gpui/src/platform/linux/x11/window.rs

@@ -147,7 +147,6 @@ pub struct Callbacks {
     input: Option<Box<dyn FnMut(PlatformInput) -> crate::DispatchEventResult>>,
     active_status_change: Option<Box<dyn FnMut(bool)>>,
     resize: Option<Box<dyn FnMut(Size<Pixels>, f32)>>,
-    fullscreen: Option<Box<dyn FnMut(bool)>>,
     moved: Option<Box<dyn FnMut()>>,
     should_close: Option<Box<dyn FnMut() -> bool>>,
     close: Option<Box<dyn FnOnce()>>,