Get rid of Editor leaks in CodeStyleSettings (IDEA-95395) [CR-IC-6178]

platform/lang-impl/src/com/intellij/application/options/CodeStyleSchemesConfigurable.java

@@ -346,34 +346,31 @@ public class CodeStyleSchemesConfigurable extends SearchableConfigurable.Parent.
       String displayName = myProvider.getConfigurableDisplayName();
       if (displayName != null) return displayName;
       
-      return ensurePanel().getDisplayName();  // fallback for 8.0 API compatibility
+      return myPanel != null ? myPanel.getDisplayName() : null;  // fallback for 8.0 API compatibility
     }
 
     @Override
     public String getHelpTopic() {
-      return ensurePanel().getHelpTopic();
-    }
-
-    private CodeStyleMainPanel ensurePanel() {
-      if (myPanel == null) {
-        myPanel = new CodeStyleMainPanel(ensureModel(), myLangSelector, myFactory);
-      }
-      return myPanel;
+      return myPanel != null ? myPanel.getHelpTopic() : null;
     }
 
     @Override
     public JComponent createComponent() {
-      return ensurePanel();
+      myPanel = new CodeStyleMainPanel(ensureModel(), myLangSelector, myFactory);
+      return myPanel;
     }
 
     @Override
     public boolean isModified() {
-      boolean someSchemeModified = ensurePanel().isModified();
-      if (someSchemeModified) {
-        myApplyCompleted = false;
-        myRevertCompleted = false;
+      if (myPanel != null) {
+        boolean someSchemeModified = myPanel.isModified();
+        if (someSchemeModified) {
+          myApplyCompleted = false;
+          myRevertCompleted = false;
+        }
+        return someSchemeModified;
       }
-      return someSchemeModified;
+      return false;
     }
 
     @Override
@@ -428,20 +425,25 @@ public class CodeStyleSchemesConfigurable extends SearchableConfigurable.Parent.
     }
 
     public boolean isPanelModified(CodeStyleScheme scheme) {
-      return ensurePanel().isModified(scheme);
+      return myPanel != null && myPanel.isModified(scheme);
     }
 
     public boolean isPanelModified() {
-      return ensurePanel().isModified();
+      return myPanel != null && myPanel.isModified();
     }
 
     public void applyPanel() throws ConfigurationException {
-      ensurePanel().apply();
+      if (myPanel != null) {
+        myPanel.apply();
+      }
     }
 
     @Override
     public Set<String> processListOptions() {
-      return ensurePanel().processListOptions();
+      if (myPanel == null) {
+        myPanel = new CodeStyleMainPanel(ensureModel(), myLangSelector, myFactory);
+      }
+      return myPanel.processListOptions();
     }
   }
 }