change signature detection: ignore changes in import list

java/java-impl/src/com/intellij/refactoring/changeSignature/JavaChangeSignatureDetector.java

@@ -381,6 +381,11 @@ public class JavaChangeSignatureDetector implements LanguageChangeSignatureDetec
     }.execute();
   }
 
+  @Override
+  public boolean ignoreChanges(PsiElement element) {
+    return PsiTreeUtil.getParentOfType(element, PsiImportList.class) != null;
+  }
+
   private static boolean isInsideMethodSignature(PsiElement element, @NotNull PsiMethod method) {
     final PsiCodeBlock body = method.getBody();
     if (body != null) {

platform/lang-impl/src/com/intellij/refactoring/changeSignature/ChangeSignatureGestureDetector.java

@@ -199,6 +199,7 @@ public class ChangeSignatureGestureDetector extends PsiTreeChangeAdapter impleme
       if (changeBean != null && changeBean.getInitialText() != null) {
         final Editor editor = myFileEditorManager.getSelectedTextEditor();
         if (editor != null && myTemplateManager.getActiveTemplate(editor) != null) return;
+        if (LanguageChangeSignatureDetectors.INSTANCE.forLanguage(child.getLanguage()).ignoreChanges(child)) return;
         final ChangeInfo info = LanguageChangeSignatureDetectors.createCurrentChangeInfo(child, changeBean.getInitialChangeInfo());
         if (info == null) {
           changeBean.reinit();

platform/lang-impl/src/com/intellij/refactoring/changeSignature/LanguageChangeSignatureDetector.java

@@ -39,4 +39,6 @@ public interface LanguageChangeSignatureDetector {
   boolean isMoveParameterAvailable(PsiElement parameter, boolean left);
 
   void moveParameter(PsiElement parameter, Editor editor, boolean left);
+
+  boolean ignoreChanges(PsiElement element);
 }