On Wayland, commit the window surface after setting the decoration mode

Fixes #2064.

CHANGELOG.md

@@ -21,6 +21,7 @@
 - **Breaking:** On Android, bump `ndk` and `ndk-glue` to 0.4.
 - On Windows, increase wait timer resolution for more accurate timing when using `WaitUntil`.
 - On macOS, fix native file dialogs hanging the event loop.
+- On Wayland, implement a workaround for wrong configure size when using `xdg_decoration` in `kwin_wayland`
 
 # 0.25.0 (2021-05-15)
 

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

@@ -139,6 +139,12 @@ impl Window {
         } else {
             window.set_decorate(Decorations::None);
         }
+        // Without this commit here at least on kwin 5.23.3 the initial configure
+        // will have a size (1,1), the second configure including the decoration
+        // mode will have the min_size as its size. With this commit the initial
+        // configure will have no size, the application will draw it's content
+        // with the initial size and everything works as expected afterwards.
+        window.surface().commit();
 
         // Min dimensions.
         let min_size = attributes