From 41a99c686b92f0138f3dd1e8eeaf8be399fcaa20 Mon Sep 17 00:00:00 2001
From: Conrad Irwin <conrad.irwin@gmail.com>
Date: Mon, 22 Jan 2024 11:10:15 -0700
Subject: [PATCH] Potential fix for #2422

---
 crates/gpui/src/platform/mac/window.rs | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/crates/gpui/src/platform/mac/window.rs b/crates/gpui/src/platform/mac/window.rs
index 1ef5d346cc..9e9699fb05 100644
--- a/crates/gpui/src/platform/mac/window.rs
+++ b/crates/gpui/src/platform/mac/window.rs
@@ -1003,9 +1003,21 @@ impl PlatformWindow for MacWindow {
 }
 
 fn get_scale_factor(native_window: id) -> f32 {
-    unsafe {
+    let factor = unsafe {
         let screen: id = msg_send![native_window, screen];
         NSScreen::backingScaleFactor(screen) as f32
+    };
+
+    // We are not certain what triggers this, but it seems that sometimes
+    // this method would return 0 (https://github.com/zed-industries/community/issues/2422)
+    // It seems most likely that this would happen if the window has no screen
+    // (if it is off-screen), though we'd expect to see viewDidChangeBackingProperties before
+    // it was rendered for real.
+    // Regardless, attempt to avoid the issue here.
+    if factor == 0.0 {
+        2.
+    } else {
+        factor
     }
 }