From f82a147dce05f01dd8f55ccca721f8da4305d57f Mon Sep 17 00:00:00 2001
From: Sergey Malenkov <sergey.malenkov@jetbrains.com>
Date: Fri, 18 Jan 2019 18:05:02 +0300
Subject: [PATCH] IDEA-198348: hide track of transparent scroll bar on Mac if
 thumb is hidden

---
 .../src/com/intellij/ui/components/MacScrollBarUI.java       | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/platform/platform-api/src/com/intellij/ui/components/MacScrollBarUI.java b/platform/platform-api/src/com/intellij/ui/components/MacScrollBarUI.java
index 04f2b3598d1b..37de3f7e69b3 100644
--- a/platform/platform-api/src/com/intellij/ui/components/MacScrollBarUI.java
+++ b/platform/platform-api/src/com/intellij/ui/components/MacScrollBarUI.java
@@ -87,6 +87,11 @@ final class MacScrollBarUI extends DefaultScrollBarUI {
   void onThumbHover(boolean hover) {
   }
 
+  @Override
+  void paintTrack(Graphics2D g, JComponent c) {
+    if (myTrack.animator.myValue > 0 && myThumb.animator.myValue > 0 || isOpaque(c)) super.paintTrack(g, c);
+  }
+
   @Override
   void paintThumb(Graphics2D g, JComponent c) {
     if (isOpaque(c)) {