fix(windows): remove WS_CAPTION and WS_EX_WINDOWEDGE for child wi…

…ndows (#864)

* fix(windows): remove `WS_CAPTION` and `WS_EX_WINDOWEDGE` for child windows

* remove when decorations disabled only

* actually remove

.changes/child-styles.md

@@ -0,0 +1,5 @@
+---
+"tao": "patch"
+---
+
+On Windows, Remove `WS_CAPTION` and `WS_EX_WINDOWEDGE` window styles when creating a child window.

src/platform_impl/windows/window_state.rs

@@ -231,9 +231,8 @@ impl WindowFlags {
 
   pub fn to_window_styles(self) -> (WINDOW_STYLE, WINDOW_EX_STYLE) {
     let (mut style, mut style_ex) = (Default::default(), Default::default());
-    style |= WS_CLIPSIBLINGS | WS_SYSMENU | WS_CAPTION;
-    style_ex |= WS_EX_ACCEPTFILES | WS_EX_WINDOWEDGE;
-
+    style |= WS_CAPTION | WS_CLIPSIBLINGS | WS_SYSMENU;
+    style_ex |= WS_EX_WINDOWEDGE | WS_EX_ACCEPTFILES;
     if self.contains(WindowFlags::RESIZABLE) {
       style |= WS_SIZEBOX;
     }
@@ -257,6 +256,12 @@ impl WindowFlags {
     }
     if self.contains(WindowFlags::CHILD) {
       style |= WS_CHILD; // This is incompatible with WS_POPUP if that gets added eventually.
+
+      // Remove decorations window styles for child
+      if !self.contains(WindowFlags::MARKER_DECORATIONS) {
+        style &= !WS_CAPTION;
+        style_ex &= !WS_EX_WINDOWEDGE;
+      }
     }
     if self.contains(WindowFlags::POPUP) {
       style |= WS_POPUP;