Resize when size changes on scale change on macOS

This fixes an issue where the window glitched due to resize
when the user doesn't actually change the window, but macOS
function to update window size was still called.

src/changelog/unreleased.md

@@ -53,3 +53,4 @@ changelog entry.
 ### Fixed
 
 - On macOS, fix panic on exit when dropping windows outside the event loop.
+- On macOS, fix window dragging glitches when dragging across a monitor boundary with different scale factor.

src/platform_impl/macos/app_delegate.rs

@@ -375,9 +375,11 @@ impl ApplicationDelegate {
 
                     let physical_size = *new_inner_size.lock().unwrap();
                     drop(new_inner_size);
-                    let logical_size = physical_size.to_logical(scale_factor);
-                    let size = NSSize::new(logical_size.width, logical_size.height);
-                    window.setContentSize(size);
+                    if physical_size != suggested_size {
+                        let logical_size = physical_size.to_logical(scale_factor);
+                        let size = NSSize::new(logical_size.width, logical_size.height);
+                        window.setContentSize(size);
+                    }
 
                     let resized_event = Event::WindowEvent {
                         window_id: RootWindowId(window.id()),