Registry: remove "ide.scroll.thumb.small.if.opaque" property

platform/platform-api/src/com/intellij/ui/components/DefaultScrollBarUI.java

@@ -127,7 +127,7 @@ class DefaultScrollBarUI extends ScrollBarUI {
 
   void paintThumb(Graphics2D g, int x, int y, int width, int height, JComponent c) {
     RegionPainter<Float> p = ScrollColorProducer.isDark(c) ? ScrollPainter.Thumb.DARCULA : ScrollPainter.Thumb.DEFAULT;
-    paint(p, g, x, y, width, height, c, myThumbAnimator.myValue, Registry.is("ide.scroll.thumb.small.if.opaque"));
+    paint(p, g, x, y, width, height, c, myThumbAnimator.myValue, true);
   }
 
   void onThumbMove() {

platform/platform-api/src/com/intellij/util/ui/ButtonlessScrollBarUI.java

@@ -719,7 +719,7 @@ public class ButtonlessScrollBarUI extends BasicScrollBarUI {
         bounds.width -= vertical ? 1 : 0;
         bounds.height -= vertical ? 0 : 1;
       }
-      else if (Registry.is("ide.scroll.thumb.small.if.opaque")) {
+      else {
         bounds.x += 1;
         bounds.y += 1;
         bounds.width -= 2;

platform/util/resources/misc/registry.properties

@@ -124,8 +124,6 @@ ide.scroll.align.component=true
 ide.scroll.background.auto=true
 ide.scroll.background.auto.description=Use background color of a view to paint viewport, scroll pane, and scroll bars.
 
-ide.scroll.thumb.small.if.opaque=true
-
 mac.scroll.horizontal.gap=false
 mac.scroll.horizontal.gap.description=Shows additional space after the last row of a list or a tree. Affect MacOS only. // Malenkov