ComboBox and Spinner:

- added `buttonSeparatorColor` and `buttonDisabledSeparatorColor`
- fixed styling of `borderColor` and `disabledBorderColor`

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

@@ -549,6 +549,8 @@ public class IntelliJTheme
 		uiKeyMapping.put( "ComboBox.ArrowButton.disabledIconColor",     "ComboBox.buttonDisabledArrowColor" );
 		uiKeyMapping.put( "ComboBox.ArrowButton.iconColor",             "ComboBox.buttonArrowColor" );
 		uiKeyMapping.put( "ComboBox.ArrowButton.nonEditableBackground", "ComboBox.buttonBackground" );
+		uiKeyCopying.put( "ComboBox.buttonSeparatorColor",              "Component.borderColor" );
+		uiKeyCopying.put( "ComboBox.buttonDisabledSeparatorColor",      "Component.disabledBorderColor" );
 
 		// Component
 		uiKeyMapping.put( "Component.inactiveErrorFocusColor",   "Component.error.borderColor" );
@@ -594,6 +596,10 @@ public class IntelliJTheme
 		uiKeyCopying.put( "Slider.thumbColor", "ProgressBar.foreground" );
 		uiKeyCopying.put( "Slider.trackColor", "ProgressBar.background" );
 
+		// Spinner
+		uiKeyCopying.put( "Spinner.buttonSeparatorColor",         "Component.borderColor" );
+		uiKeyCopying.put( "Spinner.buttonDisabledSeparatorColor", "Component.disabledBorderColor" );
+
 		// TitlePane
 		uiKeyCopying.put( "TitlePane.inactiveBackground",     "TitlePane.background" );
 		uiKeyMapping.put( "TitlePane.infoForeground",         "TitlePane.foreground" );

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

@@ -95,8 +95,6 @@ import com.formdev.flatlaf.util.SystemInfo;
  * @uiDefault ComboBox.buttonStyle				String	auto (default), button or none
  * @uiDefault Component.arrowType				String	chevron (default) or triangle
  * @uiDefault Component.isIntelliJTheme			boolean
- * @uiDefault Component.borderColor				Color
- * @uiDefault Component.disabledBorderColor		Color
  * @uiDefault ComboBox.editableBackground		Color	optional; defaults to ComboBox.background
  * @uiDefault ComboBox.focusedBackground		Color	optional
  * @uiDefault ComboBox.disabledBackground		Color
@@ -104,6 +102,8 @@ 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.buttonSeparatorColor		Color	optional
+ * @uiDefault ComboBox.buttonDisabledSeparatorColor Color	optional
  * @uiDefault ComboBox.buttonArrowColor			Color
  * @uiDefault ComboBox.buttonDisabledArrowColor	Color
  * @uiDefault ComboBox.buttonHoverArrowColor	Color
@@ -121,8 +121,6 @@ public class FlatComboBoxUI
 	@Styleable protected String buttonStyle;
 	@Styleable protected String arrowType;
 	protected boolean isIntelliJTheme;
-	@Styleable protected Color borderColor;
-	@Styleable protected Color disabledBorderColor;
 
 	@Styleable protected Color editableBackground;
 	@Styleable protected Color focusedBackground;
@@ -132,6 +130,8 @@ public class FlatComboBoxUI
 	@Styleable protected Color buttonBackground;
 	@Styleable protected Color buttonEditableBackground;
 	@Styleable protected Color buttonFocusedBackground;
+	/** @since 2 */ @Styleable protected Color buttonSeparatorColor;
+	/** @since 2 */ @Styleable protected Color buttonDisabledSeparatorColor;
 	@Styleable protected Color buttonArrowColor;
 	@Styleable protected Color buttonDisabledArrowColor;
 	@Styleable protected Color buttonHoverArrowColor;
@@ -215,8 +215,6 @@ public class FlatComboBoxUI
 		buttonStyle = UIManager.getString( "ComboBox.buttonStyle" );
 		arrowType = UIManager.getString( "Component.arrowType" );
 		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
-		borderColor = UIManager.getColor( "Component.borderColor" );
-		disabledBorderColor = UIManager.getColor( "Component.disabledBorderColor" );
 
 		editableBackground = UIManager.getColor( "ComboBox.editableBackground" );
 		focusedBackground = UIManager.getColor( "ComboBox.focusedBackground" );
@@ -226,6 +224,8 @@ public class FlatComboBoxUI
 		buttonBackground = UIManager.getColor( "ComboBox.buttonBackground" );
 		buttonFocusedBackground = UIManager.getColor( "ComboBox.buttonFocusedBackground" );
 		buttonEditableBackground = UIManager.getColor( "ComboBox.buttonEditableBackground" );
+		buttonSeparatorColor = UIManager.getColor( "ComboBox.buttonSeparatorColor" );
+		buttonDisabledSeparatorColor = UIManager.getColor( "ComboBox.buttonDisabledSeparatorColor" );
 		buttonArrowColor = UIManager.getColor( "ComboBox.buttonArrowColor" );
 		buttonDisabledArrowColor = UIManager.getColor( "ComboBox.buttonDisabledArrowColor" );
 		buttonHoverArrowColor = UIManager.getColor( "ComboBox.buttonHoverArrowColor" );
@@ -247,9 +247,6 @@ public class FlatComboBoxUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
-		borderColor = null;
-		disabledBorderColor = null;
-
 		editableBackground = null;
 		focusedBackground = null;
 		disabledBackground = null;
@@ -258,6 +255,8 @@ public class FlatComboBoxUI
 		buttonBackground = null;
 		buttonEditableBackground = null;
 		buttonFocusedBackground = null;
+		buttonSeparatorColor = null;
+		buttonDisabledSeparatorColor = null;
 		buttonArrowColor = null;
 		buttonDisabledArrowColor = null;
 		buttonHoverArrowColor = null;
@@ -555,10 +554,13 @@ public class FlatComboBoxUI
 
 			// paint vertical line between value and arrow button
 			if( paintButton ) {
-				g2.setColor( enabled ? borderColor : disabledBorderColor );
+				Color separatorColor = enabled ? buttonSeparatorColor : buttonDisabledSeparatorColor;
-				float lw = scale( 1f );
+				if( separatorColor != null ) {
-				float lx = isLeftToRight ? arrowX : arrowX + arrowWidth - lw;
+					g2.setColor( separatorColor );
-				g2.fill( new Rectangle2D.Float( lx, focusWidth, lw, height - 1 - (focusWidth * 2)) );
+					float lw = scale( 1f );
+					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/FlatSpinnerUI.java

@@ -68,12 +68,12 @@ import com.formdev.flatlaf.util.LoggingFacade;
  * @uiDefault Spinner.buttonStyle				String	button (default) or none
  * @uiDefault Component.arrowType				String	chevron (default) or triangle
  * @uiDefault Component.isIntelliJTheme			boolean
- * @uiDefault Component.borderColor				Color
- * @uiDefault Component.disabledBorderColor		Color
  * @uiDefault Spinner.disabledBackground		Color
  * @uiDefault Spinner.disabledForeground		Color
  * @uiDefault Spinner.focusedBackground			Color	optional
  * @uiDefault Spinner.buttonBackground			Color
+ * @uiDefault Spinner.buttonSeparatorColor		Color	optional
+ * @uiDefault Spinner.buttonDisabledSeparatorColor Color	optional
  * @uiDefault Spinner.buttonArrowColor			Color
  * @uiDefault Spinner.buttonDisabledArrowColor	Color
  * @uiDefault Spinner.buttonHoverArrowColor		Color
@@ -92,12 +92,12 @@ public class FlatSpinnerUI
 	@Styleable protected String buttonStyle;
 	@Styleable protected String arrowType;
 	protected boolean isIntelliJTheme;
-	@Styleable protected Color borderColor;
-	@Styleable protected Color disabledBorderColor;
 	@Styleable protected Color disabledBackground;
 	@Styleable protected Color disabledForeground;
 	@Styleable protected Color focusedBackground;
 	@Styleable protected Color buttonBackground;
+	/** @since 2 */ @Styleable protected Color buttonSeparatorColor;
+	/** @since 2 */ @Styleable protected Color buttonDisabledSeparatorColor;
 	@Styleable protected Color buttonArrowColor;
 	@Styleable protected Color buttonDisabledArrowColor;
 	@Styleable protected Color buttonHoverArrowColor;
@@ -128,12 +128,12 @@ public class FlatSpinnerUI
 		buttonStyle = UIManager.getString( "Spinner.buttonStyle" );
 		arrowType = UIManager.getString( "Component.arrowType" );
 		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
-		borderColor = UIManager.getColor( "Component.borderColor" );
-		disabledBorderColor = UIManager.getColor( "Component.disabledBorderColor" );
 		disabledBackground = UIManager.getColor( "Spinner.disabledBackground" );
 		disabledForeground = UIManager.getColor( "Spinner.disabledForeground" );
 		focusedBackground = UIManager.getColor( "Spinner.focusedBackground" );
 		buttonBackground = UIManager.getColor( "Spinner.buttonBackground" );
+		buttonSeparatorColor = UIManager.getColor( "Spinner.buttonSeparatorColor" );
+		buttonDisabledSeparatorColor = UIManager.getColor( "Spinner.buttonDisabledSeparatorColor" );
 		buttonArrowColor = UIManager.getColor( "Spinner.buttonArrowColor" );
 		buttonDisabledArrowColor = UIManager.getColor( "Spinner.buttonDisabledArrowColor" );
 		buttonHoverArrowColor = UIManager.getColor( "Spinner.buttonHoverArrowColor" );
@@ -147,12 +147,12 @@ public class FlatSpinnerUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
-		borderColor = null;
-		disabledBorderColor = null;
 		disabledBackground = null;
 		disabledForeground = null;
 		focusedBackground = null;
 		buttonBackground = null;
+		buttonSeparatorColor = null;
+		buttonDisabledSeparatorColor = null;
 		buttonArrowColor = null;
 		buttonDisabledArrowColor = null;
 		buttonHoverArrowColor = null;
@@ -394,10 +394,13 @@ public class FlatSpinnerUI
 			}
 
 			// paint vertical line between value and arrow buttons
-			g2.setColor( enabled ? borderColor : disabledBorderColor );
+			Color separatorColor = enabled ? buttonSeparatorColor : buttonDisabledSeparatorColor;
-			float lw = scale( 1f );
+			if( separatorColor != null ) {
-			float lx = isLeftToRight ? arrowX : arrowX + arrowWidth - lw;
+				g2.setColor( separatorColor );
-			g2.fill( new Rectangle2D.Float( lx, focusWidth, lw, height - 1 - (focusWidth * 2) ) );
+				float lw = scale( 1f );
+				float lx = isLeftToRight ? arrowX : arrowX + arrowWidth - lw;
+				g2.fill( new Rectangle2D.Float( lx, focusWidth, lw, height - 1 - (focusWidth * 2) ) );
+			}
 		}
 
 		paint( g, c );

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

@@ -214,6 +214,8 @@ ComboBox.maximumRowCount = 15
 ComboBox.buttonStyle = auto
 ComboBox.background = @textComponentBackground
 ComboBox.buttonBackground = @textComponentBackground
+ComboBox.buttonSeparatorColor = $Component.borderColor
+ComboBox.buttonDisabledSeparatorColor = $Component.disabledBorderColor
 ComboBox.buttonArrowColor = @buttonArrowColor
 ComboBox.buttonDisabledArrowColor = @buttonDisabledArrowColor
 ComboBox.buttonHoverArrowColor = @buttonHoverArrowColor
@@ -547,6 +549,8 @@ Slider.focusWidth = 4
 Spinner.border = com.formdev.flatlaf.ui.FlatRoundBorder
 Spinner.background = @textComponentBackground
 Spinner.buttonBackground = $ComboBox.buttonEditableBackground
+Spinner.buttonSeparatorColor = $Component.borderColor
+Spinner.buttonDisabledSeparatorColor = $Component.disabledBorderColor
 Spinner.buttonArrowColor = @buttonArrowColor
 Spinner.buttonDisabledArrowColor = @buttonDisabledArrowColor
 Spinner.buttonHoverArrowColor = @buttonHoverArrowColor

flatlaf-core/src/test/java/com/formdev/flatlaf/ui/TestFlatStyleableInfo.java

@@ -151,8 +151,6 @@ public class TestFlatStyleableInfo
 			"editorColumns", int.class,
 			"buttonStyle", String.class,
 			"arrowType", String.class,
-			"borderColor", Color.class,
-			"disabledBorderColor", Color.class,
 
 			"editableBackground", Color.class,
 			"focusedBackground", Color.class,
@@ -162,6 +160,8 @@ public class TestFlatStyleableInfo
 			"buttonBackground", Color.class,
 			"buttonFocusedBackground", Color.class,
 			"buttonEditableBackground", Color.class,
+			"buttonSeparatorColor", Color.class,
+			"buttonDisabledSeparatorColor", Color.class,
 			"buttonArrowColor", Color.class,
 			"buttonDisabledArrowColor", Color.class,
 			"buttonHoverArrowColor", Color.class,
@@ -598,12 +598,12 @@ public class TestFlatStyleableInfo
 			"minimumWidth", int.class,
 			"buttonStyle", String.class,
 			"arrowType", String.class,
-			"borderColor", Color.class,
-			"disabledBorderColor", Color.class,
 			"disabledBackground", Color.class,
 			"disabledForeground", Color.class,
 			"focusedBackground", Color.class,
 			"buttonBackground", Color.class,
+			"buttonSeparatorColor", Color.class,
+			"buttonDisabledSeparatorColor", Color.class,
 			"buttonArrowColor", Color.class,
 			"buttonDisabledArrowColor", Color.class,
 			"buttonHoverArrowColor", Color.class,

flatlaf-core/src/test/java/com/formdev/flatlaf/ui/TestFlatStyling.java

@@ -236,8 +236,6 @@ public class TestFlatStyling
 		ui.applyStyle( "editorColumns: 10" );
 		ui.applyStyle( "buttonStyle: auto" );
 		ui.applyStyle( "arrowType: chevron" );
-		ui.applyStyle( "borderColor: #fff" );
-		ui.applyStyle( "disabledBorderColor: #fff" );
 
 		ui.applyStyle( "editableBackground: #fff" );
 		ui.applyStyle( "focusedBackground: #fff" );
@@ -247,6 +245,8 @@ public class TestFlatStyling
 		ui.applyStyle( "buttonBackground: #fff" );
 		ui.applyStyle( "buttonFocusedBackground: #fff" );
 		ui.applyStyle( "buttonEditableBackground: #fff" );
+		ui.applyStyle( "buttonSeparatorColor: #fff" );
+		ui.applyStyle( "buttonDisabledSeparatorColor: #fff" );
 		ui.applyStyle( "buttonArrowColor: #fff" );
 		ui.applyStyle( "buttonDisabledArrowColor: #fff" );
 		ui.applyStyle( "buttonHoverArrowColor: #fff" );
@@ -702,12 +702,12 @@ public class TestFlatStyling
 		ui.applyStyle( "minimumWidth: 100" );
 		ui.applyStyle( "buttonStyle: button" );
 		ui.applyStyle( "arrowType: chevron" );
-		ui.applyStyle( "borderColor: #fff" );
-		ui.applyStyle( "disabledBorderColor: #fff" );
 		ui.applyStyle( "disabledBackground: #fff" );
 		ui.applyStyle( "disabledForeground: #fff" );
 		ui.applyStyle( "focusedBackground: #fff" );
 		ui.applyStyle( "buttonBackground: #fff" );
+		ui.applyStyle( "buttonSeparatorColor: #fff" );
+		ui.applyStyle( "buttonDisabledSeparatorColor: #fff" );
 		ui.applyStyle( "buttonArrowColor: #fff" );
 		ui.applyStyle( "buttonDisabledArrowColor: #fff" );
 		ui.applyStyle( "buttonHoverArrowColor: #fff" );

flatlaf-testing/dumps/uidefaults/FlatDarkLaf_1.8.0_202.txt

@@ -192,10 +192,12 @@ ComboBox.buttonArrowColor      #9a9da1  HSL 214   4  62    javax.swing.plaf.Colo
 ComboBox.buttonBackground      #45494a  HSL 192   3  28    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonDarkShadow      #7e7e7e  HSL   0   0  49    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonDisabledArrowColor #5a5d61  HSL 214   4  37    javax.swing.plaf.ColorUIResource [UI]
+ComboBox.buttonDisabledSeparatorColor #646464  HSL   0   0  39    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonEditableBackground #404445  HSL 192   4  26    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonHighlight       #242424  HSL   0   0  14    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonHoverArrowColor #b4b7ba  HSL 210   4  72    com.formdev.flatlaf.util.DerivedColor [UI]    lighten(10%)
 ComboBox.buttonPressedArrowColor #cfd0d2  HSL 220   3  82    com.formdev.flatlaf.util.DerivedColor [UI]    lighten(20%)
+ComboBox.buttonSeparatorColor  #646464  HSL   0   0  39    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonShadow          #646464  HSL   0   0  39    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonStyle           auto
 ComboBox.disabledBackground    #3c3f41  HSL 204   4  25    javax.swing.plaf.ColorUIResource [UI]
@@ -950,8 +952,10 @@ Spinner.border                 [lazy] 1,1,1,1  false    com.formdev.flatlaf.ui.F
 Spinner.buttonArrowColor       #9a9da1  HSL 214   4  62    javax.swing.plaf.ColorUIResource [UI]
 Spinner.buttonBackground       #404445  HSL 192   4  26    javax.swing.plaf.ColorUIResource [UI]
 Spinner.buttonDisabledArrowColor #5a5d61  HSL 214   4  37    javax.swing.plaf.ColorUIResource [UI]
+Spinner.buttonDisabledSeparatorColor #646464  HSL   0   0  39    javax.swing.plaf.ColorUIResource [UI]
 Spinner.buttonHoverArrowColor  #b4b7ba  HSL 210   4  72    com.formdev.flatlaf.util.DerivedColor [UI]    lighten(10%)
 Spinner.buttonPressedArrowColor #cfd0d2  HSL 220   3  82    com.formdev.flatlaf.util.DerivedColor [UI]    lighten(20%)
+Spinner.buttonSeparatorColor   #646464  HSL   0   0  39    javax.swing.plaf.ColorUIResource [UI]
 Spinner.buttonStyle            button
 Spinner.disabledBackground     #3c3f41  HSL 204   4  25    javax.swing.plaf.ColorUIResource [UI]
 Spinner.disabledForeground     #888888  HSL   0   0  53    javax.swing.plaf.ColorUIResource [UI]

flatlaf-testing/dumps/uidefaults/FlatLightLaf_1.8.0_202.txt

@@ -196,10 +196,12 @@ ComboBox.buttonArrowColor      #666666  HSL   0   0  40    javax.swing.plaf.Colo
 ComboBox.buttonBackground      #ffffff  HSL   0   0 100    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonDarkShadow      #9e9e9e  HSL   0   0  62    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonDisabledArrowColor #a6a6a6  HSL   0   0  65    javax.swing.plaf.ColorUIResource [UI]
+ComboBox.buttonDisabledSeparatorColor #cecece  HSL   0   0  81    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonEditableBackground #fafafa  HSL   0   0  98    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonHighlight       #ffffff  HSL   0   0 100    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonHoverArrowColor #999999  HSL   0   0  60    com.formdev.flatlaf.util.DerivedColor [UI]    lighten(20%)
 ComboBox.buttonPressedArrowColor #b3b3b3  HSL   0   0  70    com.formdev.flatlaf.util.DerivedColor [UI]    lighten(30%)
+ComboBox.buttonSeparatorColor  #c4c4c4  HSL   0   0  77    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonShadow          #c4c4c4  HSL   0   0  77    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonStyle           auto
 ComboBox.disabledBackground    #f2f2f2  HSL   0   0  95    javax.swing.plaf.ColorUIResource [UI]
@@ -955,8 +957,10 @@ Spinner.border                 [lazy] 1,1,1,1  false    com.formdev.flatlaf.ui.F
 Spinner.buttonArrowColor       #666666  HSL   0   0  40    javax.swing.plaf.ColorUIResource [UI]
 Spinner.buttonBackground       #fafafa  HSL   0   0  98    javax.swing.plaf.ColorUIResource [UI]
 Spinner.buttonDisabledArrowColor #a6a6a6  HSL   0   0  65    javax.swing.plaf.ColorUIResource [UI]
+Spinner.buttonDisabledSeparatorColor #cecece  HSL   0   0  81    javax.swing.plaf.ColorUIResource [UI]
 Spinner.buttonHoverArrowColor  #999999  HSL   0   0  60    com.formdev.flatlaf.util.DerivedColor [UI]    lighten(20%)
 Spinner.buttonPressedArrowColor #b3b3b3  HSL   0   0  70    com.formdev.flatlaf.util.DerivedColor [UI]    lighten(30%)
+Spinner.buttonSeparatorColor   #c4c4c4  HSL   0   0  77    javax.swing.plaf.ColorUIResource [UI]
 Spinner.buttonStyle            button
 Spinner.disabledBackground     #f2f2f2  HSL   0   0  95    javax.swing.plaf.ColorUIResource [UI]
 Spinner.disabledForeground     #8c8c8c  HSL   0   0  55    javax.swing.plaf.ColorUIResource [UI]

flatlaf-testing/dumps/uidefaults/FlatTestLaf_1.8.0_202.txt

@@ -193,11 +193,13 @@ ComboBox.buttonArrowColor      #666666  HSL   0   0  40    javax.swing.plaf.Colo
 ComboBox.buttonBackground      #f0f0f0  HSL   0   0  94    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonDarkShadow      #696969  HSL   0   0  41    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonDisabledArrowColor #ababab  HSL   0   0  67    javax.swing.plaf.ColorUIResource [UI]
+ComboBox.buttonDisabledSeparatorColor #000088  HSL 240 100  27    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonEditableBackground #cccccc  HSL   0   0  80    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonFocusedBackground #ffff00  HSL  60 100  50    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonHighlight       #ffffff  HSL   0   0 100    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonHoverArrowColor #ff0000  HSL   0 100  50    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonPressedArrowColor #0000ff  HSL 240 100  50    javax.swing.plaf.ColorUIResource [UI]
+ComboBox.buttonSeparatorColor  #ff0000  HSL   0 100  50    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonShadow          #a0a0a0  HSL   0   0  63    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.buttonStyle           auto
 ComboBox.disabledBackground    #e0e0e0  HSL   0   0  88    javax.swing.plaf.ColorUIResource [UI]
@@ -955,8 +957,10 @@ Spinner.border                 [lazy] 1,1,1,1  false    com.formdev.flatlaf.ui.F
 Spinner.buttonArrowColor       #666666  HSL   0   0  40    javax.swing.plaf.ColorUIResource [UI]
 Spinner.buttonBackground       #cccccc  HSL   0   0  80    javax.swing.plaf.ColorUIResource [UI]
 Spinner.buttonDisabledArrowColor #ababab  HSL   0   0  67    javax.swing.plaf.ColorUIResource [UI]
+Spinner.buttonDisabledSeparatorColor #000088  HSL 240 100  27    javax.swing.plaf.ColorUIResource [UI]
 Spinner.buttonHoverArrowColor  #ff0000  HSL   0 100  50    javax.swing.plaf.ColorUIResource [UI]
 Spinner.buttonPressedArrowColor #0000ff  HSL 240 100  50    javax.swing.plaf.ColorUIResource [UI]
+Spinner.buttonSeparatorColor   #ff0000  HSL   0 100  50    javax.swing.plaf.ColorUIResource [UI]
 Spinner.buttonStyle            button
 Spinner.disabledBackground     #e0e0e0  HSL   0   0  88    javax.swing.plaf.ColorUIResource [UI]
 Spinner.disabledForeground     #000088  HSL 240 100  27    javax.swing.plaf.ColorUIResource [UI]

flatlaf-theme-editor/src/main/resources/com/formdev/flatlaf/themeeditor/FlatLafUIKeys.txt

@@ -149,11 +149,13 @@ ComboBox.buttonArrowColor
 ComboBox.buttonBackground
 ComboBox.buttonDarkShadow
 ComboBox.buttonDisabledArrowColor
+ComboBox.buttonDisabledSeparatorColor
 ComboBox.buttonEditableBackground
 ComboBox.buttonFocusedBackground
 ComboBox.buttonHighlight
 ComboBox.buttonHoverArrowColor
 ComboBox.buttonPressedArrowColor
+ComboBox.buttonSeparatorColor
 ComboBox.buttonShadow
 ComboBox.buttonStyle
 ComboBox.disabledBackground
@@ -713,8 +715,10 @@ Spinner.border
 Spinner.buttonArrowColor
 Spinner.buttonBackground
 Spinner.buttonDisabledArrowColor
+Spinner.buttonDisabledSeparatorColor
 Spinner.buttonHoverArrowColor
 Spinner.buttonPressedArrowColor
+Spinner.buttonSeparatorColor
 Spinner.buttonStyle
 Spinner.disabledBackground
 Spinner.disabledForeground