status bar should have a height at least of an icon, even before any icons appear, to prevent unnecessary blinking (IDEA-114453)

platform/platform-impl/src/com/intellij/openapi/wm/impl/status/IdeStatusBarImpl.java

@@ -52,6 +52,7 @@ import java.util.List;
  * User: spLeaner
  */
 public class IdeStatusBarImpl extends JComponent implements StatusBarEx {
+  private static final int MIN_ICON_HEIGHT = 18;
   private final InfoAndProgressPanel myInfoAndProgressPanel;
   private IdeFrame myFrame;
 
@@ -176,6 +177,16 @@ public class IdeStatusBarImpl extends JComponent implements StatusBarEx {
     this(null);
   }
 
+  @Override
+  public Dimension getPreferredSize() {
+    Dimension size = super.getPreferredSize();
+    if (size == null) return null;
+    
+    Insets insets = getInsets();
+    int minHeight = insets.top + insets.bottom + MIN_ICON_HEIGHT;
+    return new Dimension(size.width, Math.max(size.height, minHeight));
+  }
+
   @Override
   public void addWidget(@NotNull final StatusBarWidget widget) {
     addWidget(widget, Position.RIGHT, "__AUTODETECT__");
@@ -839,7 +850,7 @@ public class IdeStatusBarImpl extends JComponent implements StatusBarEx {
 
     @Override
     public Dimension getMinimumSize() {
-      return new Dimension(24, 18);
+      return new Dimension(24, MIN_ICON_HEIGHT);
     }
 
     @Override