[ui] IJPL-215581 Light Islands: 'Write Thread' widget has black background

GitOrigin-RevId: b15f8a29e2a88c284865707ec4e3927dfaa094c8

platform/platform-impl/src/com/intellij/openapi/wm/impl/status/WriteThreadIndicatorWidgetFactory.kt

@@ -13,10 +13,12 @@ import com.intellij.openapi.wm.StatusBar
 import com.intellij.openapi.wm.StatusBarWidget
 import com.intellij.openapi.wm.StatusBarWidgetFactory
 import com.intellij.platform.ide.CoreUiCoroutineScopeHolder
+import com.intellij.ui.ExperimentalUI
 import com.intellij.ui.JBColor
 import com.intellij.ui.UIBundle
 import com.intellij.util.ThreeState
 import com.intellij.util.cancelOnDispose
+import com.intellij.util.ui.JBUI
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
@@ -94,6 +96,16 @@ private class WriteThreadWidget : CustomStatusBarWidget {
   override fun ID(): String = ID
 
   private inner class MyComponent : JPanel() {
+
+    init {
+      if (ExperimentalUI.isNewUI()) {
+        isOpaque = false
+
+        // Don't allow hover be inside the widget
+        border = JBUI.Borders.empty()
+      }
+    }
+
     override fun getPreferredSize(): Dimension = WIDGET_SIZE
 
     override fun getMinimumSize(): Dimension = WIDGET_SIZE
@@ -106,6 +118,10 @@ private class WriteThreadWidget : CustomStatusBarWidget {
         return
       }
 
+      if (ExperimentalUI.isNewUI()) {
+        g.translate((width - WIDGET_SIZE.width) / 2, (height - WIDGET_SIZE.height) / 2)
+      }
+
       for ((xOffset, stats) in statsDeque.withIndex()) {
         g.color = JBColor.GRAY
         g.fillRect(xOffset, 0, 1, WIDGET_SIZE.height)