windows feature WS_EX_NOREDIRECTIONBITMAP (#575)

* set WS_EX_NOREDIRECTIONBITMAP

* add CHANGELOG.md

* more flexibility.

* Skip DwmEnableBlurBehindWindow if no_redirection_bitmap is enabled.

src/platform/windows/mod.rs

@@ -11,6 +11,7 @@ pub use self::window::Window;
 pub struct PlatformSpecificWindowBuilderAttributes {
     pub parent: Option<HWND>,
     pub taskbar_icon: Option<::Icon>,
+    pub no_redirection_bitmap: bool,
 }
 
 unsafe impl Send for PlatformSpecificWindowBuilderAttributes {}

src/platform/windows/window.rs

@@ -888,6 +888,9 @@ unsafe fn init(
     if attributes.always_on_top {
         ex_style |= winuser::WS_EX_TOPMOST;
     }
+    if pl_attribs.no_redirection_bitmap {
+        ex_style |= winuser::WS_EX_NOREDIRECTIONBITMAP;
+    }
 
     // adjusting the window coordinates using the style
     winuser::AdjustWindowRectEx(&mut rect, style, 0, ex_style);
@@ -999,7 +1002,7 @@ unsafe fn init(
     };
 
     // making the window transparent
-    if attributes.transparent {
+    if attributes.transparent && !pl_attribs.no_redirection_bitmap {
         let bb = dwmapi::DWM_BLURBEHIND {
             dwFlags: 0x1, // FIXME: DWM_BB_ENABLE;
             fEnable: 1,