IJPL-223929 Gradient for tool window stripes is missing when dragging tool window icon

GitOrigin-RevId: c3f4ed6b7358348ba98327f30458d3d0bfe11e6b

platform/platform-impl/src/com/intellij/openapi/wm/impl/AbstractDroppableStripe.kt

@@ -550,8 +550,10 @@ internal abstract class AbstractDroppableStripe(val paneId: String, layoutManage
   override fun paintComponent(g: Graphics) {
     super.paintComponent(g)
     if (!isFinishingDrop && isDroppingButton()) {
-      g.color = if (isNewStripes) JBUI.CurrentTheme.ToolWindow.DragAndDrop.STRIPE_BACKGROUND else background.brighter()
-      g.fillRect(0, 0, width, height)
+      if (!isNewStripes) {
+        g.color = background.brighter()
+        g.fillRect(0, 0, width, height)
+      }
       val rectangle = Rectangle(drawRectangle)
       if (!rectangle.isEmpty) {
         var round: Int? = null

platform/platform-resources/src/themes/islands/ManyIslandsDark.theme.json

@@ -136,8 +136,7 @@
         "background": "BackgroundLight",
         "borderColor": "BorderTransparent",
         "separatorColor": "Gray5"
-      },
-      "Button.DragAndDrop.stripeBackground": "BackgroundLight"
+      }
     },
 
     "StripeToolbar.Button": {
@@ -733,7 +732,6 @@
 
       "ToolWindow.Header.inactiveBackground": "#212326",
       "ToolWindow.background": "#212326",
-      "ToolWindow.Button.DragAndDrop.stripeBackground": "AltBackgroundLight",
 
       "Borders.color": "#2E3033",
       "Borders.ContrastBorderColor": "#2E3033",

platform/platform-resources/src/themes/islands/ManyIslandsLight.theme.json

@@ -91,8 +91,7 @@
       "Stripe": {
         "background": "BackgroundDark",
         "borderColor": "BorderTransparent"
-      },
-      "Button.DragAndDrop.stripeBackground": "BackgroundDark"
+      }
     },
 
     "StripeToolbar.Button": {
@@ -261,7 +260,6 @@
 
       "ToolWindow.Header.inactiveBackground": "#F7F6F8",
       "ToolWindow.background": "#F7F6F8",
-      "ToolWindow.Button.DragAndDrop.stripeBackground": "AltBackgroundDark",
 
       "Borders.color": "#E8E9ED",
       "Borders.ContrastBorderColor": "#E8E9ED",

platform/util/ui/api-dump.txt

@@ -4704,7 +4704,6 @@ com.intellij.util.ui.JBUI$CurrentTheme$ToolWindow$DragAndDrop
 - sf:BUTTON_DROP_BACKGROUND:java.awt.Color
 - sf:BUTTON_DROP_BORDER:java.awt.Color
 - sf:BUTTON_FLOATING_BACKGROUND:java.awt.Color
-- sf:STRIPE_BACKGROUND:java.awt.Color
 f:com.intellij.util.ui.JBUI$CurrentTheme$Toolbar
 - sf:SEPARATOR_COLOR:java.awt.Color
 - <init>():V

platform/util/ui/src/com/intellij/util/ui/JBUI.java

@@ -1123,8 +1123,6 @@ public final class JBUI {
       }
 
       public interface DragAndDrop {
-        Color STRIPE_BACKGROUND = JBColor.namedColor("ToolWindow.Button.DragAndDrop.stripeBackground",
-                                                     CurrentTheme.DragAndDrop.Area.BACKGROUND);
         Color BUTTON_DROP_BACKGROUND = JBColor.namedColor("ToolWindow.Button.DragAndDrop.buttonDropBackground",
                                                           CurrentTheme.DragAndDrop.Area.BACKGROUND);
         Color BUTTON_FLOATING_BACKGROUND = JBColor.namedColor("ToolWindow.Button.DragAndDrop.buttonFloatingBackground",