From a7fac65d62c1cd51b5c7d8d56dd5dc2505898bbd Mon Sep 17 00:00:00 2001
From: Lukas Wirth <lukas@zed.dev>
Date: Thu, 6 Nov 2025 18:33:09 +0100
Subject: [PATCH] gpui: Remove unneeded weak Rc cycle in `WindowsWindowInner`
 (#42119)

Release Notes:

- N/A *or* Added/Fixed/Improved ...
---
 crates/gpui/src/gpui.rs                    |  4 +-
 crates/gpui/src/platform/windows/window.rs | 79 +++++++++++-----------
 2 files changed, 42 insertions(+), 41 deletions(-)

diff --git a/crates/gpui/src/gpui.rs b/crates/gpui/src/gpui.rs
index 2e391b6e44..098c0780b2 100644
--- a/crates/gpui/src/gpui.rs
+++ b/crates/gpui/src/gpui.rs
@@ -107,7 +107,7 @@ pub use util::{FutureExt, Timeout, arc_cow::ArcCow};
 pub use view::*;
 pub use window::*;
 
-use std::{any::Any, borrow::BorrowMut, future::Future};
+use std::{any::Any, future::Future};
 use taffy::TaffyLayoutEngine;
 
 /// The context trait, allows the different contexts in GPUI to be used
@@ -253,7 +253,7 @@ pub trait BorrowAppContext {
 
 impl<C> BorrowAppContext for C
 where
-    C: BorrowMut<App>,
+    C: std::borrow::BorrowMut<App>,
 {
     fn set_global<G: Global>(&mut self, global: G) {
         self.borrow_mut().set_global(global)
diff --git a/crates/gpui/src/platform/windows/window.rs b/crates/gpui/src/platform/windows/window.rs
index ea1027f826..f0e0beb7ca 100644
--- a/crates/gpui/src/platform/windows/window.rs
+++ b/crates/gpui/src/platform/windows/window.rs
@@ -61,7 +61,6 @@ pub struct WindowsWindowState {
 
 pub(crate) struct WindowsWindowInner {
     hwnd: HWND,
-    pub(super) this: Weak<Self>,
     drop_target_helper: IDropTargetHelper,
     pub(crate) state: RefCell<WindowsWindowState>,
     pub(crate) system_settings: RefCell<WindowsSystemSettings>,
@@ -215,9 +214,8 @@ impl WindowsWindowInner {
             context.disable_direct_composition,
         )?);
 
-        Ok(Rc::new_cyclic(|this| Self {
+        Ok(Rc::new(Self {
             hwnd,
-            this: this.clone(),
             drop_target_helper: context.drop_target_helper.clone(),
             state,
             handle: context.handle,
@@ -232,11 +230,8 @@ impl WindowsWindowInner {
         }))
     }
 
-    fn toggle_fullscreen(&self) {
-        let Some(this) = self.this.upgrade() else {
-            log::error!("Unable to toggle fullscreen: window has been dropped");
-            return;
-        };
+    fn toggle_fullscreen(self: &Rc<Self>) {
+        let this = self.clone();
         self.executor
             .spawn(async move {
                 let mut lock = this.state.borrow_mut();
@@ -246,36 +241,42 @@ impl WindowsWindowInner {
                     y,
                     cx,
                     cy,
-                } = if let Some(state) = lock.fullscreen.take() {
-                    state
-                } else {
-                    let (window_bounds, _) = lock.calculate_window_bounds();
-                    lock.fullscreen_restore_bounds = window_bounds;
-                    let style = WINDOW_STYLE(unsafe { get_window_long(this.hwnd, GWL_STYLE) } as _);
-                    let mut rc = RECT::default();
-                    unsafe { GetWindowRect(this.hwnd, &mut rc) }
-                        .context("failed to get window rect")
-                        .log_err();
-                    let _ = lock.fullscreen.insert(StyleAndBounds {
-                        style,
-                        x: rc.left,
-                        y: rc.top,
-                        cx: rc.right - rc.left,
-                        cy: rc.bottom - rc.top,
-                    });
-                    let style = style
-                        & !(WS_THICKFRAME
-                            | WS_SYSMENU
-                            | WS_MAXIMIZEBOX
-                            | WS_MINIMIZEBOX
-                            | WS_CAPTION);
-                    let physical_bounds = lock.display.physical_bounds();
-                    StyleAndBounds {
-                        style,
-                        x: physical_bounds.left().0,
-                        y: physical_bounds.top().0,
-                        cx: physical_bounds.size.width.0,
-                        cy: physical_bounds.size.height.0,
+                } = match lock.fullscreen.take() {
+                    Some(state) => state,
+                    None => {
+                        let (window_bounds, _) = lock.calculate_window_bounds();
+                        lock.fullscreen_restore_bounds = window_bounds;
+                        drop(lock);
+
+                        let style =
+                            WINDOW_STYLE(unsafe { get_window_long(this.hwnd, GWL_STYLE) } as _);
+                        let mut rc = RECT::default();
+                        unsafe { GetWindowRect(this.hwnd, &mut rc) }
+                            .context("failed to get window rect")
+                            .log_err();
+
+                        lock = this.state.borrow_mut();
+                        let _ = lock.fullscreen.insert(StyleAndBounds {
+                            style,
+                            x: rc.left,
+                            y: rc.top,
+                            cx: rc.right - rc.left,
+                            cy: rc.bottom - rc.top,
+                        });
+                        let style = style
+                            & !(WS_THICKFRAME
+                                | WS_SYSMENU
+                                | WS_MAXIMIZEBOX
+                                | WS_MINIMIZEBOX
+                                | WS_CAPTION);
+                        let physical_bounds = lock.display.physical_bounds();
+                        StyleAndBounds {
+                            style,
+                            x: physical_bounds.left().0,
+                            y: physical_bounds.top().0,
+                            cx: physical_bounds.size.width.0,
+                            cy: physical_bounds.size.height.0,
+                        }
                     }
                 };
                 drop(lock);
@@ -296,7 +297,7 @@ impl WindowsWindowInner {
             .detach();
     }
 
-    fn set_window_placement(&self) -> Result<()> {
+    fn set_window_placement(self: &Rc<Self>) -> Result<()> {
         let Some(open_status) = self.state.borrow_mut().initial_placement.take() else {
             return Ok(());
         };