Window decorations: window title bar width is no longer considered when calculating preferred/minimum width of window (issue #351)

CHANGELOG.md

@@ -33,6 +33,8 @@ FlatLaf Change Log
   - `2px` at `1.25x` and `2.25x` in **IntelliJ** and **Darcula** themes
 - OptionPane: Do not make child components, which are derived from `JPanel`,
   non-opaque. (issue #349)
+- Window decorations: Window title bar width is no longer considered when
+  calculating preferred/minimum width of window. (issue #351)
 
 
 ## 1.3

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

@@ -342,7 +342,7 @@ public class FlatRootPaneUI
 				? getSizeFunc.apply( rootPane.getContentPane() )
 				: rootPane.getSize();
 
-			int width = Math.max( titlePaneSize.width, contentSize.width );
+			int width = contentSize.width; // title pane width is not considered here
 			int height = titlePaneSize.height + contentSize.height;
 			if( titlePane == null || !titlePane.isMenuBarEmbedded() ) {
 				JMenuBar menuBar = rootPane.getJMenuBar();