FIXED IDEA-149066 Code style is not per project (confusing "Per project" message)

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

@@ -34,7 +34,7 @@ import javax.swing.*;
 import java.util.*;
 
 public class CodeStyleSchemesConfigurable extends SearchableConfigurable.Parent.Abstract
-  implements OptionsContainingConfigurable, Configurable.NoMargin, Configurable.NoScroll {
+  implements OptionsContainingConfigurable, Configurable.NoMargin, Configurable.NoScroll, Configurable.VariableProjectAppLevel {
 
   private CodeStyleSchemesPanel myRootSchemesPanel;
   private CodeStyleSchemesModel myModel;
@@ -323,6 +323,11 @@ public class CodeStyleSchemesConfigurable extends SearchableConfigurable.Parent.
     return result;
   }
 
+  @Override
+  public boolean isProjectLevel() {
+    return myModel != null && myModel.isUsePerProjectSettings();
+  }
+
   private class CodeStyleConfigurableWrapper implements SearchableConfigurable, NoMargin, NoScroll, OptionsContainingConfigurable {
     private boolean myInitialResetInvoked;
     private CodeStyleMainPanel myPanel;

platform/platform-api/src/com/intellij/openapi/options/Configurable.java

@@ -186,4 +186,16 @@ public interface Configurable extends UnnamedConfigurable {
   interface NoMargin {
     // see ConfigurableCardPanel#create(Configurable)
   }
+
+  /**
+   * Allows to dynamically define if current configurable settings apply to current project or to the IDE and update "For current project" 
+   * indicator accordingly.
+   */
+  interface VariableProjectAppLevel {
+    /**
+     * @return True if current settings apply to the current project (enable "For current project" indicator), false for application-level
+     *         (IDE) settings.
+     */
+    boolean isProjectLevel();
+  }
 }

platform/platform-impl/src/com/intellij/openapi/options/newEditor/SettingsTreeView.java

@@ -269,8 +269,7 @@ final class SettingsTreeView extends JComponent implements Accessible, Disposabl
   @Nullable
   Project findConfigurableProject(@Nullable Configurable configurable) {
     if (configurable instanceof ConfigurableWrapper) {
-      ConfigurableWrapper wrapper = (ConfigurableWrapper)configurable;
-      return wrapper.getExtensionPoint().getProject();
+      return getProjectFromWrapper((ConfigurableWrapper)configurable);
     }
     return findConfigurableProject(findNode(configurable));
   }
@@ -280,8 +279,7 @@ final class SettingsTreeView extends JComponent implements Accessible, Disposabl
     if (node != null) {
       Configurable configurable = node.myConfigurable;
       if (configurable instanceof ConfigurableWrapper) {
-        ConfigurableWrapper wrapper = (ConfigurableWrapper)configurable;
-        return wrapper.getExtensionPoint().getProject();
+        return getProjectFromWrapper((ConfigurableWrapper)configurable);
       }
       SimpleNode parent = node.getParent();
       if (parent instanceof MyNode) {
@@ -290,6 +288,15 @@ final class SettingsTreeView extends JComponent implements Accessible, Disposabl
     }
     return null;
   }
+  
+  @Nullable
+  private static Project getProjectFromWrapper(@NotNull ConfigurableWrapper wrapper) {
+    UnnamedConfigurable wrapped = wrapper.getConfigurable();
+    if (wrapped instanceof Configurable.VariableProjectAppLevel && !((Configurable.VariableProjectAppLevel)wrapped).isProjectLevel()) {
+      return null;
+    }
+    return wrapper.getExtensionPoint().getProject();
+  }
 
   private static int getLeftMargin(int level) {
     return 3 + level * (11 + ICON_GAP);