SplitPane: scale one-touch buttons

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatLaf.java

@@ -285,15 +285,15 @@ public abstract class FlatLaf
 			key.endsWith( "Margins" ) || key.endsWith( "Insets" ) )
 			return parseInsets( value );
 
-		// size
-		if( key.endsWith( "Size" ) && !key.equals( "SplitPane.dividerSize" ))
-			return parseSize( value );
-
 		// scaled number
 		ScaledNumber scaledNumber = parseScaledNumber( key, value );
 		if( scaledNumber != null )
 			return scaledNumber;
 
+		// size
+		if( key.endsWith( "Size" ) && !key.equals( "SplitPane.dividerSize" ))
+			return parseSize( value );
+
 		// width, height
 		if( key.endsWith( "Width" ) || key.endsWith( "Height" ) )
 			return parseInteger( value, true );
@@ -400,8 +400,10 @@ public abstract class FlatLaf
 	}
 
 	private ScaledNumber parseScaledNumber( String key, String value ) {
-		if( !key.equals( "OptionPane.buttonMinimumWidth" ) )
+		if( !key.equals( "OptionPane.buttonMinimumWidth" ) &&
-			return null; // not supported
+			!key.equals( "SplitPane.oneTouchButtonSize" ) &&
+			!key.equals( "SplitPane.oneTouchButtonOffset" ) )
+		  return null; // not supported
 
 		try {
 			return new ScaledNumber( Integer.parseInt( value ) );

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

@@ -126,8 +126,16 @@ public class FlatArrowButton
 
 		int w = scale( chevron ? 8 : 9 );
 		int h = scale( chevron ? 4 : 5 );
-		int x = Math.round( (width - (vert ? w : h)) / 2f + scale( (float) xOffset ) );
+		int rw = vert ? w : h;
-		int y = Math.round( (height - (vert ? h : w)) / 2f + scale( (float) yOffset ) );
+		int rh = vert ? h : w;
+		int x = Math.round( (width - rw) / 2f + scale( (float) xOffset ) );
+		int y = Math.round( (height - rh) / 2f + scale( (float) yOffset ) );
+
+		// optimization for small chevron arrows (e.g. OneTouchButtons in SplitPane)
+		if( x + rw >= width && x > 0 )
+			x--;
+		if( y + rh >= height && y > 0 )
+			y--;
 
 		// paint arrow
 		g.setColor( enabled

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

@@ -307,6 +307,8 @@ SplitPane.dividerSize=5
 SplitPane.continuousLayout=true
 SplitPane.border=null
 SplitPane.centerOneTouchButtons=true
+SplitPane.oneTouchButtonSize=6
+SplitPane.oneTouchButtonOffset=2
 
 SplitPaneDivider.border=null
 SplitPaneDivider.oneTouchArrowColor=@@ComboBox.buttonArrowColor