Fixed incorrect popup background for undecorated popups.

core/src/main/java/com/github/weisj/darklaf/ui/DarkPopupFactory.java

@@ -30,6 +30,8 @@ import javax.swing.*;
 
 import com.github.weisj.darklaf.platform.DecorationsHandler;
 import com.github.weisj.darklaf.ui.rootpane.DarkRootPaneUI;
+import com.github.weisj.darklaf.uiresource.DarkColorUIResource;
+import com.github.weisj.darklaf.util.ColorUtil;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.Pair;
 import com.github.weisj.darklaf.util.PropertyUtil;
@@ -95,13 +97,13 @@ public class DarkPopupFactory extends PopupFactory {
                                final boolean isFocusable, final boolean startHidden) {
         boolean noDecorations = PropertyUtil.getBooleanProperty(contents, KEY_NO_DECORATION);
         boolean opaque = PropertyUtil.getBooleanProperty(contents, KEY_OPAQUE);
-        setupWindowBackground(window, opaque);
+        setupWindowBackground(window, opaque, !noDecorations);
         setupWindowFocusableState(isFocusable, window);
         setupWindowDecorations(window, noDecorations);
         setupWindowOpacity(contents, startHidden, window);
     }
 
-    protected void setupWindowBackground(final Window window, final boolean opaque) {
+    protected void setupWindowBackground(final Window window, final boolean opaque, final boolean decorations) {
         // Sometimes the background is java.awt.SystemColor[i=7]
         // It results in a flash of white background, that is repainted with
         // the proper popup background later.
@@ -112,7 +114,8 @@ public class DarkPopupFactory extends PopupFactory {
             if (opaque) {
                 window.setBackground(rootPane.getBackground());
             } else {
-                window.setBackground(getTranslucentPopupBackground());
+                Color bg = getTranslucentPopupBackground(decorations);
+                window.setBackground(bg);
             }
         }
     }
@@ -154,8 +157,10 @@ public class DarkPopupFactory extends PopupFactory {
         return heavyWeightParent;
     }
 
-    protected Color getTranslucentPopupBackground() {
-        return UIManager.getColor("PopupMenu.translucentBackground");
+    protected Color getTranslucentPopupBackground(final boolean decorated) {
+        Color c = UIManager.getColor("PopupMenu.translucentBackground");
+        if (!decorated) c = new DarkColorUIResource(ColorUtil.toAlpha(c, 0));
+        return c;
     }
 
     private static class HeavyWeightParent extends JComponent {

core/src/main/java/com/github/weisj/darklaf/ui/tooltip/DarkTooltipUI.java

@@ -122,6 +122,7 @@ public class DarkTooltipUI extends BasicToolTipUI implements PropertyChangeListe
         toolTip.putClientProperty(DarkPopupFactory.KEY_NO_DECORATION, true);
         toolTip.putClientProperty(DarkPopupFactory.KEY_START_HIDDEN, true);
         toolTip.putClientProperty(DarkPopupFactory.KEY_FORCE_HEAVYWEIGHT, true);
+        // toolTip.putClientProperty(DarkPopupFactory.KEY_OPAQUE, false);
         fadeAnimator = new FadeInAnimator();
         c.setOpaque(false);
         DarkTooltipBorder border = new DarkTooltipBorder();

windows/src/main/cpp/Decorations.cpp

@@ -320,7 +320,7 @@ LRESULT CALLBACK WindowWrapper::WindowProc(_In_ HWND hwnd, _In_ UINT uMsg, _In_
         case WM_PAINT:
         if (!wrapper->bgBrush)
         break;
-        if (!wrapper->moving)
+        if (!wrapper->moving || wrapper->popup_menu)
         PaintBackground(hwnd, wParam, wrapper);
         if (uMsg == WM_ERASEBKGND)
         return TRUE;