set correct antialiasing info on SimpleColoredComponent (fix for IDEA-152454)

platform/editor-ui-api/src/com/intellij/ide/ui/UISettings.java

@@ -39,6 +39,7 @@ import com.intellij.util.xmlb.annotations.Property;
 import com.intellij.util.xmlb.annotations.Transient;
 import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
+import sun.swing.SwingUtilities2;
 
 import javax.swing.*;
 import java.awt.*;
@@ -276,7 +277,10 @@ public class UISettings extends SimpleModificationTracker implements PersistentS
     }
   }
 
-  /* This method must not be used for set up antialiasing for editor components
+  /**
+   *  This method must not be used for set up antialiasing for editor components. To make sure antialiasing settings are taken into account
+   *  when preferred size of component is calculated, {@link #setupComponentAntialiasing(JComponent)} method should be called from
+   *  <code>updateUI()</code> or <code>setUI()</code> method of component.
    */
   public static void setupAntialiasing(final Graphics g) {
 
@@ -301,4 +305,11 @@ public class UISettings extends SimpleModificationTracker implements PersistentS
 
       setupFractionalMetrics(g2d);
   }
+
+  /**
+   * @see #setupComponentAntialiasing(JComponent)
+   */
+  public static void setupComponentAntialiasing(JComponent component) {
+    component.putClientProperty(SwingUtilities2.AA_TEXT_PROPERTY_KEY, AntialiasingType.getAAHintForSwingComponent());
+  }
 }

platform/platform-api/src/com/intellij/ui/SimpleColoredComponent.java

@@ -123,6 +123,12 @@ public class SimpleColoredComponent extends JComponent implements Accessible, Co
     myFragmentPadding = new TIntIntHashMap(10);
     myFragmentAlignment = new TIntIntHashMap(10);
     setOpaque(true);
+    updateUI();
+  }
+
+  @Override
+  public void updateUI() {
+    UISettings.setupComponentAntialiasing(this);
   }
 
   @NotNull