ToolBar: fixed endless loop if button in Toolbar has focus and is made invisible (issue #884)

CHANGELOG.md

@@ -9,6 +9,8 @@ FlatLaf Change Log
   using custom component that overrides `Component.contains(int x, int y)` and
   invokes `SwingUtilities.convertPoint()` (or similar) from the overridden
   method. (issue #878)
+- ToolBar: Fixed endless loop if button in Toolbar has focus and is made
+  invisible. (issue #884)
 
 
 ## 3.5.1

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

@@ -531,8 +531,11 @@ public class FlatToolBarUI
 
 		private Component getRecentComponent( Container aContainer, boolean first ) {
 			// if moving focus into the toolbar, focus recently focused toolbar button
-			if( focusedCompIndex >= 0 && focusedCompIndex < toolBar.getComponentCount() )
-				return toolBar.getComponent( focusedCompIndex );
+			if( focusedCompIndex >= 0 && focusedCompIndex < toolBar.getComponentCount() ) {
+				Component c = toolBar.getComponent( focusedCompIndex );
+				if( accept( c ) )
+					return c;
+			}
 
 			return first
 				? super.getFirstComponent( aContainer )