WEB-19193 JSCS: Import Code Styles: new scheme is not created and not added to the schemes list

correct refresh after schema creation (the bug was there)
 also fix the case when nothing was selected in a table in manage schemas dialog

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

@@ -276,7 +276,7 @@ public class CodeStyleSchemesConfigurable extends SearchableConfigurable.Parent.
 
         @Override
         public void schemeChanged(final CodeStyleScheme scheme) {
-          reset();
+          if (scheme == myModel.getSelectedScheme()) myRootSchemesPanel.onSelectedSchemeChanged();
         }
       });
     }

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

@@ -189,6 +189,10 @@ public class CodeStyleSchemesModel {
     myDispatcher.getMulticaster().schemeChanged(scheme);
   }
 
+  public void fireSchemeListChanged() {
+    myDispatcher.getMulticaster().schemeListChanged();
+  }
+
   public CodeStyleScheme getSelectedGlobalScheme() {
     return myGlobalSelected;
   }

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

@@ -199,9 +199,10 @@ public class ManageCodeStyleSchemesDialog extends DialogWrapper {
       CodeStyleSchemesUIConfiguration.Util.setRecentImportFile(selectedFile);
       final SchemeCreator schemeCreator = new SchemeCreator();
       final CodeStyleScheme
-        schemeImported = importer.importScheme(myModel.getProject(), selectedFile, myModel.getSelectedScheme(), schemeCreator);
+        schemeImported = importer.importScheme(myModel.getProject(), selectedFile, getSelectedScheme(), schemeCreator);
       if (schemeImported != null) {
-        myModel.fireSchemeChanged(schemeImported);
+        if (schemeCreator.isSchemeWasCreated()) myModel.fireSchemeListChanged();
+        else myModel.fireSchemeChanged(schemeImported);
         return schemeImported;
       }
     }
@@ -230,15 +231,23 @@ public class ManageCodeStyleSchemesDialog extends DialogWrapper {
   }
 
   private void updateActions() {
-    CodeStyleScheme selectedScheme = getSelectedScheme();
-    myDeleteButton.setEnabled(!(selectedScheme.isDefault() || mySchemesTableModel.isProjectScheme(selectedScheme)));
-    myCopyToProjectButton.setEnabled(!mySchemesTableModel.isProjectScheme(selectedScheme));
+    // there is a possibility that nothing will be selected in a table. So we just need to corresponding disable actions
+    final CodeStyleScheme selectedScheme = getSelectedInTableScheme();
+    myDeleteButton.setEnabled(selectedScheme != null && (!(selectedScheme.isDefault() || mySchemesTableModel.isProjectScheme(selectedScheme))));
+    myCopyToProjectButton.setEnabled(selectedScheme != null && !mySchemesTableModel.isProjectScheme(selectedScheme));
+  }
+
+  @Nullable
+  private CodeStyleScheme getSelectedInTableScheme() {
+    int row = mySchemesTable.getSelectedRow();
+    if (row < 0) return null;
+    return mySchemesTableModel.getSchemeAt(row);
   }
 
   @NotNull
   private CodeStyleScheme getSelectedScheme() {
     int row = mySchemesTable.getSelectedRow();
-    assert row >= 0;
+    if (row < 0) row = mySchemesTableModel.getDefaultRow();
     return mySchemesTableModel.getSchemeAt(row);
   }
 
@@ -270,13 +279,21 @@ public class ManageCodeStyleSchemesDialog extends DialogWrapper {
   }
 
   private class SchemeCreator implements SchemeFactory<CodeStyleScheme> {
+    private boolean mySchemeWasCreated;
+
     @Override
     public CodeStyleScheme createNewScheme(@Nullable String targetName) {
+      mySchemeWasCreated = true;
       if (targetName == null) targetName = ApplicationBundle.message("code.style.scheme.import.unnamed");
       final int row = mySchemesTableModel.createNewScheme(getSelectedScheme(), targetName);
+
       mySchemesTable.getSelectionModel().setSelectionInterval(row, row);
       return mySchemesTableModel.getSchemeAt(row);
     }
+
+    public boolean isSchemeWasCreated() {
+      return mySchemeWasCreated;
+    }
   }
 
   private class MySchemesTable extends JBTable {
@@ -368,7 +385,7 @@ public class ManageCodeStyleSchemesDialog extends DialogWrapper {
       }
       return row;
     }
-    
+
     public int getDefaultRow() {
       int row = 0;
       for (CodeStyleScheme scheme : mySchemes) {