Native window decorations: do not use window decorations if system property sun.java2d.opengl is true on Windows 10 (issue #540)

CHANGELOG.md

@@ -12,6 +12,8 @@ FlatLaf Change Log
 - `HiDPIUtils.paintAtScale1x()` now supports rotated graphics. (issue #557)
 - Typography: No longer use `Consolas` or `Courier New` as monospaced font on
   Windows because they have bad vertically placement.
+- Native window decorations (Windows 10/11 only): Do not use window decorations
+  if system property `sun.java2d.opengl` is `true` on Windows 10. (issue #540)
 
 
 ## 2.3

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatNativeWindowBorder.java

@@ -42,11 +42,13 @@ import com.formdev.flatlaf.util.SystemInfo;
 public class FlatNativeWindowBorder
 {
 	// can use window decorations if:
-	// - on Windows 10
+	// - on Windows 10 or later
+	// - not if system property "sun.java2d.opengl" is true on Windows 10
 	// - not when running in JetBrains Projector, Webswing or WinPE
 	// - not disabled via system property
 	private static final boolean canUseWindowDecorations =
 		SystemInfo.isWindows_10_orLater &&
+		(SystemInfo.isWindows_11_orLater || !FlatSystemProperties.getBoolean( "sun.java2d.opengl", false )) &&
 		!SystemInfo.isProjector &&
 		!SystemInfo.isWebswing &&
 		!SystemInfo.isWinPE &&