ComboBox, Spinner, TextField and subclasses, CheckBox, RadioButton and Slider: support specifying width of borders

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatCheckBoxIcon.java

@@ -34,15 +34,19 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
  * Icon for {@link javax.swing.JCheckBox}.
- *
- * Note: If Component.focusWidth is greater than zero, then the outline focus border
+ * <p>
+ * <strong>Note</strong>:
+ *       If Component.focusWidth is greater than zero, then the outer focus border
  *       is painted outside of the icon bounds. Make sure that the checkbox
  *       has margins, which are equal or greater than focusWidth.
  *
- * @uiDefault CheckBox.icon.style						String	optional; "outline"/null (default) or "filled"
+ * @uiDefault CheckBox.icon.style						String	optional; "outlined"/null (default) or "filled"
  * @uiDefault Component.focusWidth						int
+ * @uiDefault Component.borderWidth						int
  * @uiDefault Component.focusColor						Color
  * @uiDefault CheckBox.icon.focusWidth					int		optional; defaults to Component.focusWidth
+ * @uiDefault CheckBox.icon.borderWidth					int or float	optional; defaults to Component.borderWidth
+ *
  * @uiDefault CheckBox.icon.focusColor					Color	optional; defaults to Component.focusColor
  * @uiDefault CheckBox.icon.borderColor					Color
  * @uiDefault CheckBox.icon.background					Color
@@ -74,6 +78,8 @@ public class FlatCheckBoxIcon
 		UIManager.getInt( "Component.focusWidth" ), style );
 	@Styleable protected Color focusColor = FlatUIUtils.getUIColor( "CheckBox.icon.focusColor",
 		UIManager.getColor( "Component.focusColor" ) );
+	/** @since 2 */ @Styleable protected float borderWidth = getUIFloat( "CheckBox.icon.borderWidth",
+		FlatUIUtils.getUIFloat( "Component.borderWidth", 1 ), style );
 	@Styleable protected int arc = FlatUIUtils.getUIInt( "CheckBox.arc", 2 );
 
 	// enabled
@@ -115,13 +121,23 @@ public class FlatCheckBoxIcon
 
 	protected static int getUIInt( String key, int defaultValue, String style ) {
 		if( style != null ) {
-			Object value = UIManager.get( styleKey( key, style ) );
-			if( value instanceof Integer )
-				return (Integer) value;
+			int value = FlatUIUtils.getUIInt( styleKey( key, style ), Integer.MIN_VALUE );
+			if( value != Integer.MIN_VALUE )
+				return value;
 		}
 		return FlatUIUtils.getUIInt( key, defaultValue );
 	}
 
+	/** @since 2 */
+	protected static float getUIFloat( String key, float defaultValue, String style ) {
+		if( style != null ) {
+			float value = FlatUIUtils.getUIFloat( styleKey( key, style ), Float.MIN_VALUE );
+			if( value != Float.MIN_VALUE )
+				return value;
+		}
+		return FlatUIUtils.getUIFloat( key, defaultValue );
+	}
+
 	private static String styleKey( String key, String style ) {
 		return key.replace( ".icon.", ".icon[" + style + "]." );
 	}
@@ -180,7 +196,7 @@ public class FlatCheckBoxIcon
 	}
 
 	protected void paintFocusBorder( Component c, Graphics2D g ) {
-		// the outline focus border is painted outside of the icon
+		// the outer focus border is painted outside of the icon
 		int wh = ICON_SIZE - 1 + (focusWidth * 2);
 		int arcwh = arc + (focusWidth * 2);
 		g.fillRoundRect( -focusWidth + 1, -focusWidth, wh, wh, arcwh, arcwh );
@@ -192,8 +208,10 @@ public class FlatCheckBoxIcon
 	}
 
 	protected void paintBackground( Component c, Graphics2D g ) {
+		float xy = borderWidth;
+		float wh = 14 - (borderWidth * 2);
 		int arcwh = arc - 1;
-		g.fillRoundRect( 2, 1, 12, 12, arcwh, arcwh );
+		g.fill( new RoundRectangle2D.Float( 1 + xy, xy, wh, wh, arcwh, arcwh ) );
 	}
 
 	protected void paintCheckmark( Component c, Graphics2D g ) {

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatRadioButtonIcon.java

@@ -23,23 +23,24 @@ import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
 
 /**
  * Icon for {@link javax.swing.JRadioButton}.
- *
- * Note: If Component.focusWidth is greater than zero, then the outline focus border
+ * <p>
+ * <strong>Note</strong>:
+ *       If Component.focusWidth is greater than zero, then the outer focus border
  *       is painted outside of the icon bounds. Make sure that the radiobutton
  *       has margins, which are equal or greater than focusWidth.
  *
- * @uiDefault RadioButton.icon.centerDiameter			int
+ * @uiDefault RadioButton.icon.centerDiameter			int or float
  *
  * @author Karl Tauber
  */
 public class FlatRadioButtonIcon
 	extends FlatCheckBoxIcon
 {
-	@Styleable protected int centerDiameter = getUIInt( "RadioButton.icon.centerDiameter", 8, style );
+	@Styleable protected float centerDiameter = getUIFloat( "RadioButton.icon.centerDiameter", 8, style );
 
 	@Override
 	protected void paintFocusBorder( Component c, Graphics2D g ) {
-		// the outline focus border is painted outside of the icon
+		// the outer focus border is painted outside of the icon
 		int wh = ICON_SIZE + (focusWidth * 2);
 		g.fillOval( -focusWidth, -focusWidth, wh, wh );
 	}
@@ -51,7 +52,9 @@ public class FlatRadioButtonIcon
 
 	@Override
 	protected void paintBackground( Component c, Graphics2D g ) {
-		g.fillOval( 1, 1, 13, 13 );
+		float xy = borderWidth;
+		float wh = 15 - (borderWidth * 2);
+		g.fill( new Ellipse2D.Float( xy, xy, wh, wh ) );
 	}
 
 	@Override

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

@@ -38,17 +38,19 @@ import com.formdev.flatlaf.util.DerivedColor;
 
 /**
  * Border for various components (e.g. {@link javax.swing.JTextField}).
- *
+ * <p>
  * There is empty space around the component border, if Component.focusWidth is greater than zero,
  * which is used to paint outer focus border.
- *
+ * <p>
  * Because there is empty space (if outer focus border is not painted),
  * UI delegates that use this border (or subclasses) must invoke
- * {@link FlatUIUtils#paintParentBackground} to paint the empty space correctly.
+ * {@link FlatUIUtils#paintParentBackground} to fill the empty space correctly.
  *
  * @uiDefault Component.focusWidth						int
  * @uiDefault Component.innerFocusWidth					int or float
  * @uiDefault Component.innerOutlineWidth				int or float
+ * @uiDefault Component.borderWidth						int or float
+ *
  * @uiDefault Component.focusColor						Color
  * @uiDefault Component.borderColor						Color
  * @uiDefault Component.disabledBorderColor				Color
@@ -69,6 +71,8 @@ public class FlatBorder
 	@Styleable protected int focusWidth = UIManager.getInt( "Component.focusWidth" );
 	@Styleable protected float innerFocusWidth = FlatUIUtils.getUIFloat( "Component.innerFocusWidth", 0 );
 	@Styleable protected float innerOutlineWidth = FlatUIUtils.getUIFloat( "Component.innerOutlineWidth", 0 );
+	/** @since 2 */ @Styleable protected float borderWidth = FlatUIUtils.getUIFloat( "Component.borderWidth", 1 );
+
 	@Styleable protected Color focusColor = UIManager.getColor( "Component.focusColor" );
 	@Styleable protected Color borderColor = UIManager.getColor( "Component.borderColor" );
 	@Styleable protected Color disabledBorderColor = UIManager.getColor( "Component.disabledBorderColor" );
@@ -105,7 +109,7 @@ public class FlatBorder
 
 			float focusWidth = scale( (float) getFocusWidth( c ) );
 			float focusInnerWidth = 0;
-			float borderWidth = scale( (float) getBorderWidth( c ) );
+			float borderWidth = scale( getBorderWidth( c ) );
 			float arc = scale( (float) getArc( c ) );
 			Color outlineColor = getOutlineColor( c );
 			Color focusColor = null;
@@ -264,8 +268,8 @@ public class FlatBorder
 	 * Returns the (unscaled) line thickness used to paint the border.
 	 * This may be different to {@link #getLineWidth}.
 	 */
-	protected int getBorderWidth( Component c ) {
-		return getLineWidth( c );
+	protected float getBorderWidth( Component c ) {
+		return borderWidth;
 	}
 
 	/**

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

@@ -32,53 +32,55 @@ import com.formdev.flatlaf.util.UIScale;
 /**
  * Border for {@link javax.swing.JButton}.
  *
+ * @uiDefault Button.arc						int
+ * @uiDefault Button.innerFocusWidth			int or float	optional; defaults to Component.innerFocusWidth
+ * @uiDefault Button.borderWidth				int or float	optional; defaults to Component.borderWidth
+ *
  * @uiDefault Button.borderColor				Color
  * @uiDefault Button.startBorderColor			Color	optional; if set, a gradient paint is used and Button.borderColor is ignored
  * @uiDefault Button.endBorderColor				Color	optional; if set, a gradient paint is used
  * @uiDefault Button.disabledBorderColor		Color
  * @uiDefault Button.focusedBorderColor			Color
  * @uiDefault Button.hoverBorderColor			Color	optional
+ *
+ * @uiDefault Button.default.borderWidth		int or float
  * @uiDefault Button.default.borderColor		Color
  * @uiDefault Button.default.startBorderColor	Color	optional; if set, a gradient paint is used and Button.default.borderColor is ignored
  * @uiDefault Button.default.endBorderColor		Color	optional; if set, a gradient paint is used
  * @uiDefault Button.default.focusedBorderColor	Color
  * @uiDefault Button.default.focusColor			Color
  * @uiDefault Button.default.hoverBorderColor	Color	optional
+ *
+ * @uiDefault Button.toolbar.focusWidth			int or float		optional; default is 1.5
  * @uiDefault Button.toolbar.focusColor			Color	optional; defaults to Component.focusColor
- * @uiDefault Button.borderWidth				int
- * @uiDefault Button.default.borderWidth		int
- * @uiDefault Button.innerFocusWidth			int or float	optional; defaults to Component.innerFocusWidth
  * @uiDefault Button.toolbar.margin				Insets
  * @uiDefault Button.toolbar.spacingInsets		Insets
- * @uiDefault Button.toolbar.focusWidth			int or float		optional; default is 1.5
- * @uiDefault Button.arc						int
  *
  * @author Karl Tauber
  */
 public class FlatButtonBorder
 	extends FlatBorder
 {
+	@Styleable protected int arc = UIManager.getInt( "Button.arc" );
+
 	protected Color endBorderColor = UIManager.getColor( "Button.endBorderColor" );
 	@Styleable protected Color hoverBorderColor = UIManager.getColor( "Button.hoverBorderColor" );
 
+	@Styleable(dot=true) protected float defaultBorderWidth = FlatUIUtils.getUIFloat( "Button.default.borderWidth", 1 );
 	@Styleable(dot=true) protected Color defaultBorderColor = FlatUIUtils.getUIColor( "Button.default.startBorderColor", "Button.default.borderColor" );
 	protected Color defaultEndBorderColor = UIManager.getColor( "Button.default.endBorderColor" );
 	@Styleable(dot=true) protected Color defaultFocusedBorderColor = UIManager.getColor( "Button.default.focusedBorderColor" );
 	@Styleable(dot=true) protected Color defaultFocusColor = UIManager.getColor( "Button.default.focusColor" );
 	@Styleable(dot=true) protected Color defaultHoverBorderColor = UIManager.getColor( "Button.default.hoverBorderColor" );
-	/** @since 1.4 */
-	@Styleable(dot=true) protected Color toolbarFocusColor = UIManager.getColor( "Button.toolbar.focusColor" );
 
-	@Styleable protected int borderWidth = UIManager.getInt( "Button.borderWidth" );
-	@Styleable(dot=true) protected int defaultBorderWidth = UIManager.getInt( "Button.default.borderWidth" );
+	/** @since 1.4 */ @Styleable(dot=true) protected float toolbarFocusWidth = FlatUIUtils.getUIFloat( "Button.toolbar.focusWidth", 1.5f );
+	/** @since 1.4 */ @Styleable(dot=true) protected Color toolbarFocusColor = UIManager.getColor( "Button.toolbar.focusColor" );
 	@Styleable(dot=true) protected Insets toolbarMargin = UIManager.getInsets( "Button.toolbar.margin" );
 	@Styleable(dot=true) protected Insets toolbarSpacingInsets = UIManager.getInsets( "Button.toolbar.spacingInsets" );
-	/** @since 1.4 */
-	@Styleable(dot=true) protected float toolbarFocusWidth = FlatUIUtils.getUIFloat( "Button.toolbar.focusWidth", 1.5f );
-	@Styleable protected int arc = UIManager.getInt( "Button.arc" );
 
 	public FlatButtonBorder() {
 		innerFocusWidth = FlatUIUtils.getUIFloat( "Button.innerFocusWidth", innerFocusWidth );
+		borderWidth = FlatUIUtils.getUIFloat( "Button.borderWidth", borderWidth );
 
 		borderColor = FlatUIUtils.getUIColor( "Button.startBorderColor", "Button.borderColor" );
 		disabledBorderColor = UIManager.getColor( "Button.disabledBorderColor" );
@@ -181,7 +183,7 @@ public class FlatButtonBorder
 	}
 
 	@Override
-	protected int getBorderWidth( Component c ) {
+	protected float getBorderWidth( Component c ) {
 		return FlatButtonUI.isDefaultButton( c ) ? defaultBorderWidth : borderWidth;
 	}
 

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

@@ -101,6 +101,7 @@ import com.formdev.flatlaf.util.SystemInfo;
  * @uiDefault ComboBox.buttonBackground			Color
  * @uiDefault ComboBox.buttonEditableBackground	Color
  * @uiDefault ComboBox.buttonFocusedBackground	Color	optional; defaults to ComboBox.focusedBackground
+ * @uiDefault ComboBox.buttonSeparatorWidth		int or float	optional; defaults to Component.borderWidth
  * @uiDefault ComboBox.buttonSeparatorColor		Color	optional
  * @uiDefault ComboBox.buttonDisabledSeparatorColor Color	optional
  * @uiDefault ComboBox.buttonArrowColor			Color
@@ -129,6 +130,7 @@ public class FlatComboBoxUI
 	@Styleable protected Color buttonBackground;
 	@Styleable protected Color buttonEditableBackground;
 	@Styleable protected Color buttonFocusedBackground;
+	/** @since 2 */ @Styleable protected float buttonSeparatorWidth;
 	/** @since 2 */ @Styleable protected Color buttonSeparatorColor;
 	/** @since 2 */ @Styleable protected Color buttonDisabledSeparatorColor;
 	@Styleable protected Color buttonArrowColor;
@@ -223,6 +225,7 @@ public class FlatComboBoxUI
 		buttonBackground = UIManager.getColor( "ComboBox.buttonBackground" );
 		buttonFocusedBackground = UIManager.getColor( "ComboBox.buttonFocusedBackground" );
 		buttonEditableBackground = UIManager.getColor( "ComboBox.buttonEditableBackground" );
+		buttonSeparatorWidth = FlatUIUtils.getUIFloat( "ComboBox.buttonSeparatorWidth", FlatUIUtils.getUIFloat( "Component.borderWidth", 1 ) );
 		buttonSeparatorColor = UIManager.getColor( "ComboBox.buttonSeparatorColor" );
 		buttonDisabledSeparatorColor = UIManager.getColor( "ComboBox.buttonDisabledSeparatorColor" );
 		buttonArrowColor = UIManager.getColor( "ComboBox.buttonArrowColor" );
@@ -556,7 +559,7 @@ public class FlatComboBoxUI
 				Color separatorColor = enabled ? buttonSeparatorColor : buttonDisabledSeparatorColor;
 				if( separatorColor != null ) {
 					g2.setColor( separatorColor );
-					float lw = scale( 1f );
+					float lw = scale( buttonSeparatorWidth );
 					float lx = isLeftToRight ? arrowX : arrowX + arrowWidth - lw;
 					g2.fill( new Rectangle2D.Float( lx, focusWidth, lw, height - 1 - (focusWidth * 2)) );
 				}

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

@@ -65,6 +65,8 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault Slider.trackWidth				int
  * @uiDefault Slider.thumbSize				Dimension
  * @uiDefault Slider.focusWidth				int
+ * @uiDefault Slider.thumbBorderWidth		int or float
+ *
  * @uiDefault Slider.trackValueColor		Color	optional; defaults to Slider.thumbColor
  * @uiDefault Slider.trackColor				Color
  * @uiDefault Slider.thumbColor				Color
@@ -86,6 +88,7 @@ public class FlatSliderUI
 	@Styleable protected int trackWidth;
 	@Styleable protected Dimension thumbSize;
 	@Styleable protected int focusWidth;
+	/** @since 2 */ @Styleable protected float thumbBorderWidth;
 
 	@Styleable protected Color trackValueColor;
 	@Styleable protected Color trackColor;
@@ -139,6 +142,7 @@ public class FlatSliderUI
 			thumbSize = new Dimension( thumbWidth, thumbWidth );
 		}
 		focusWidth = FlatUIUtils.getUIInt( "Slider.focusWidth", 4 );
+		thumbBorderWidth = FlatUIUtils.getUIFloat( "Slider.thumbBorderWidth", 1 );
 
 		trackValueColor = FlatUIUtils.getUIColor( "Slider.trackValueColor", "Slider.thumbColor" );
 		trackColor = UIManager.getColor( "Slider.trackColor" );
@@ -405,11 +409,11 @@ debug*/
 		Color focusedColor = FlatUIUtils.deriveColor( this.focusedColor,
 			(foreground != defaultForeground) ? foreground : focusBaseColor );
 
-		paintThumb( g, slider, thumbRect, isRoundThumb(), color, borderColor, focusedColor, focusWidth );
+		paintThumb( g, slider, thumbRect, isRoundThumb(), color, borderColor, focusedColor, thumbBorderWidth, focusWidth );
 	}
 
 	public static void paintThumb( Graphics g, JSlider slider, Rectangle thumbRect, boolean roundThumb,
-		Color thumbColor, Color thumbBorderColor, Color focusedColor, int focusWidth )
+		Color thumbColor, Color thumbBorderColor, Color focusedColor, float thumbBorderWidth, int focusWidth )
 	{
 		double systemScaleFactor = UIScale.getSystemScaleFactor( (Graphics2D) g );
 		if( systemScaleFactor != 1 && systemScaleFactor != 2 ) {
@@ -418,18 +422,20 @@ debug*/
 				(g2d, x2, y2, width2, height2, scaleFactor) -> {
 					paintThumbImpl( g, slider, x2, y2, width2, height2,
 						roundThumb, thumbColor, thumbBorderColor, focusedColor,
+						(float) (thumbBorderWidth * scaleFactor),
 						(float) (focusWidth * scaleFactor) );
 				} );
 			return;
 		}
 
 		paintThumbImpl( g, slider, thumbRect.x, thumbRect.y, thumbRect.width, thumbRect.height,
-			roundThumb, thumbColor, thumbBorderColor, focusedColor, focusWidth );
+			roundThumb, thumbColor, thumbBorderColor, focusedColor, thumbBorderWidth, focusWidth );
 
 	}
 
 	private static void paintThumbImpl( Graphics g, JSlider slider, int x, int y, int width, int height,
-		boolean roundThumb, Color thumbColor, Color thumbBorderColor, Color focusedColor, float focusWidth )
+		boolean roundThumb, Color thumbColor, Color thumbBorderColor, Color focusedColor,
+		float thumbBorderWidth, float focusWidth )
 	{
 		int fw = Math.round( UIScale.scale( focusWidth ) );
 		int tx = x + fw;
@@ -451,7 +457,7 @@ debug*/
 				((Graphics2D)g).fill( createRoundThumbShape( tx, ty, tw, th ) );
 
 				// paint thumb background
-				float lw = UIScale.scale( 1f );
+				float lw = UIScale.scale( thumbBorderWidth );
 				g.setColor( thumbColor );
 				((Graphics2D)g).fill( createRoundThumbShape( tx + lw, ty + lw,
 					tw - lw - lw, th - lw - lw ) );
@@ -492,7 +498,7 @@ debug*/
 					g2.fill( createDirectionalThumbShape( fw, fw, tw, th, 0 ) );
 
 					// paint thumb background
-					float lw = UIScale.scale( 1f );
+					float lw = UIScale.scale( thumbBorderWidth );
 					g2.setColor( thumbColor );
 					g2.fill( createDirectionalThumbShape( fw + lw, fw + lw,
 						tw - lw - lw, th - lw - lw - (lw * 0.4142f), 0 ) );

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

@@ -72,6 +72,7 @@ import com.formdev.flatlaf.util.LoggingFacade;
  * @uiDefault Spinner.disabledForeground		Color
  * @uiDefault Spinner.focusedBackground			Color	optional
  * @uiDefault Spinner.buttonBackground			Color
+ * @uiDefault Spinner.buttonSeparatorWidth		int or float	optional; defaults to Component.borderWidth
  * @uiDefault Spinner.buttonSeparatorColor		Color	optional
  * @uiDefault Spinner.buttonDisabledSeparatorColor Color	optional
  * @uiDefault Spinner.buttonArrowColor			Color
@@ -96,6 +97,7 @@ public class FlatSpinnerUI
 	@Styleable protected Color disabledForeground;
 	@Styleable protected Color focusedBackground;
 	@Styleable protected Color buttonBackground;
+	/** @since 2 */ @Styleable protected float buttonSeparatorWidth;
 	/** @since 2 */ @Styleable protected Color buttonSeparatorColor;
 	/** @since 2 */ @Styleable protected Color buttonDisabledSeparatorColor;
 	@Styleable protected Color buttonArrowColor;
@@ -132,6 +134,7 @@ public class FlatSpinnerUI
 		disabledForeground = UIManager.getColor( "Spinner.disabledForeground" );
 		focusedBackground = UIManager.getColor( "Spinner.focusedBackground" );
 		buttonBackground = UIManager.getColor( "Spinner.buttonBackground" );
+		buttonSeparatorWidth = FlatUIUtils.getUIFloat( "Spinner.buttonSeparatorWidth", FlatUIUtils.getUIFloat( "Component.borderWidth", 1 ) );
 		buttonSeparatorColor = UIManager.getColor( "Spinner.buttonSeparatorColor" );
 		buttonDisabledSeparatorColor = UIManager.getColor( "Spinner.buttonDisabledSeparatorColor" );
 		buttonArrowColor = UIManager.getColor( "Spinner.buttonArrowColor" );
@@ -397,7 +400,7 @@ public class FlatSpinnerUI
 			Color separatorColor = enabled ? buttonSeparatorColor : buttonDisabledSeparatorColor;
 			if( separatorColor != null ) {
 				g2.setColor( separatorColor );
-				float lw = scale( 1f );
+				float lw = scale( buttonSeparatorWidth );
 				float lx = isLeftToRight ? arrowX : arrowX + arrowWidth - lw;
 				g2.fill( new Rectangle2D.Float( lx, focusWidth, lw, height - 1 - (focusWidth * 2) ) );
 			}

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

@@ -409,7 +409,7 @@ public class FlatUIUtils
 	 * <strong>Border</strong>:
 	 * The outside bounds of the painted border are
 	 * {@code [x + focusWidth, y + focusWidth, width - (focusWidth * 2), height - (focusWidth * 2)]}.
-	 * The thickness of the painted border is {@code lineWidth}.
+	 * The thickness of the painted border is {@code borderWidth}.
 	 *
 	 * @param g the graphics context used for painting
 	 * @param x the x coordinate of the component
@@ -422,7 +422,7 @@ public class FlatUIUtils
 	 *                           the painted thickness of the focus border is {@code (focusWidth * focusWidthFraction) + focusInnerWidth}
 	 * @param focusInnerWidth the inner width of the focus border, or {@code 0};
 	 *                        if a border is painted then {@code focusInnerWidth} needs to be larger
-	 *                        than {@code lineWidth} to be not hidden by the border
+	 *                        than {@code borderWidth} to be not hidden by the border
 	 * @param borderWidth the width of the border, or {@code 0}
 	 * @param arc the arc diameter used for the outside shape of the component border;
 	 *            the other needed arc diameters are computed from this arc diameter

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLaf.properties

@@ -228,6 +228,7 @@ ComboBox.buttonPressedArrowColor = @buttonPressedArrowColor
 Component.focusWidth = 0
 Component.innerFocusWidth = 0.5
 Component.innerOutlineWidth = 1
+Component.borderWidth = 1
 Component.arc = 5
 Component.minimumWidth = 64
 # allowed values: chevron or triangle