fixed broken rendering after resizing window to minimum size and then…

… increasing size again (issue #767)

CHANGELOG.md

@@ -15,6 +15,8 @@ FlatLaf Change Log
   and #750)
 - OptionPane: Fixed styling custom panel background in `JOptionPane`. (issue
   #761)
+- Fixed broken rendering after resizing window to minimum size and then
+  increasing size again. (issue #767)
 
 
 ## 3.2.5

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

@@ -499,7 +499,7 @@ public void layoutContainer( Container parent ) {
 		@Override
 		public void invalidateLayout( Container parent ) {
 			if( titlePane != null )
-				titlePane.menuBarChanged();
+				titlePane.menuBarInvalidate();
 		}
 
 		@Override

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

@@ -276,6 +276,7 @@ public class FlatTabbedPaneUI
 	private boolean blockRollover;
 	private boolean rolloverTabClose;
 	private boolean pressedTabClose;
+	private boolean inBasicLayoutContainer;
 
 	private Object[] oldRenderingHints;
 	private Map<String, Object> oldStyleValues;
@@ -2044,14 +2045,28 @@ private TabCloseButton() {
 
 	//---- class ContainerUIResource ------------------------------------------
 
-	private static class ContainerUIResource
+	private class ContainerUIResource
 		extends JPanel
 		implements UIResource
 	{
 		private ContainerUIResource( Component c ) {
 			super( new BorderLayout() );
 			add( c );
 		}
+
+		@SuppressWarnings( "deprecation" )
+		@Override
+		public void reshape( int x, int y, int w, int h ) {
+			// Avoid that leading/trailing tab area components are temporary moved/resized
+			// to content area bounds (done in BasicTabbedPaneUI.TabbedPaneLayout.layoutContainer()
+			// and in BasicTabbedPaneUI.TabbedPaneScrollLayout.layoutContainer())
+			// and subsequently moved/resized to its final bounds within the tab area.
+			// This avoids an unnecessary repaint (and maybe re-layout) of the content area.
+			if( inBasicLayoutContainer )
+				return;
+
+			super.reshape( x, y, w, h );
+		}
 	}
 
 	//---- class FlatTabAreaButton --------------------------------------------
@@ -3009,7 +3024,12 @@ protected Dimension calculateTabAreaSize() {
 
 		@Override
 		public void layoutContainer( Container parent ) {
-			super.layoutContainer( parent );
+			inBasicLayoutContainer = true;
+			try {
+				super.layoutContainer( parent );
+			} finally {
+				inBasicLayoutContainer = false;
+			}
 
 			Rectangle bounds = tabPane.getBounds();
 			Insets insets = tabPane.getInsets();
@@ -3214,7 +3234,12 @@ public void layoutContainer( Container parent ) {
 			// runWithOriginalLayoutManager() is necessary for correct locations
 			// of tab components layed out in TabbedPaneLayout.layoutTabComponents()
 			runWithOriginalLayoutManager( () -> {
-				delegate.layoutContainer( parent );
+				inBasicLayoutContainer = true;
+				try {
+					delegate.layoutContainer( parent );
+				} finally {
+					inBasicLayoutContainer = false;
+				}
 			} );
 
 			int tabsPopupPolicy = getTabsPopupPolicy();

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

@@ -608,6 +608,10 @@ protected void menuBarLayouted() {
 		doLayout();
 	}
 
+	void menuBarInvalidate() {
+		menuBarPlaceholder.invalidate();
+	}
+
 	@Override
 	public void paint( Graphics g ) {
 		super.paint( g );