On Wayland, fix rounding issue in resizes

CHANGELOG.md

@@ -12,6 +12,7 @@ And please only add new entries to the top of this list, right below the `# Unre
 - On macOS, set resize increments only for live resizes.
 - On Wayland, fix rare crash on DPI change
 - Web: Added support for `Window::theme`.
+- On Wayland, fix rounding issues when doing resize.
 
 # 0.28.1
 

src/platform_impl/linux/wayland/event_loop/mod.rs

@@ -19,6 +19,7 @@ use sctk::environment::Environment;
 use sctk::seat::pointer::{ThemeManager, ThemeSpec};
 use sctk::WaylandSource;
 
+use crate::dpi::{LogicalSize, PhysicalSize};
 use crate::event::{Event, StartCause, WindowEvent};
 use crate::event_loop::{ControlFlow, EventLoopWindowTarget as RootEventLoopWindowTarget};
 use crate::platform_impl::platform::sticky_exit_callback;
@@ -385,7 +386,7 @@ impl<T: 'static> EventLoop<T> {
                         let window_size = window_compositor_update.size.unwrap_or(*size);
                         *size = window_size;
 
-                        window_size.to_physical(scale_factor)
+                        logical_to_physical_rounded(window_size, scale_factor)
                     });
 
                     sticky_exit_callback(
@@ -430,7 +431,7 @@ impl<T: 'static> EventLoop<T> {
                         } else {
                             *window_size = size;
                             let scale_factor = window_handle.scale_factor();
-                            let physical_size = size.to_physical(scale_factor);
+                            let physical_size = logical_to_physical_rounded(size, scale_factor);
                             Some(physical_size)
                         };
 
@@ -599,3 +600,10 @@ impl<T: 'static> EventLoop<T> {
             .map_err(|error| error.into())
     }
 }
+
+// The default routine does floor, but we need round on Wayland.
+fn logical_to_physical_rounded(size: LogicalSize<u32>, scale_factor: f64) -> PhysicalSize<u32> {
+    let width = size.width as f64 * scale_factor;
+    let height = size.height as f64 * scale_factor;
+    (width.round(), height.round()).into()
+}