JavaCodeStyleManagerImpl#hasConflictingVariableAfterwards: check variable children as well

It could be a declaration which initializer contains a lambda. In this case lambda parameter name wasn't checked
Fixes IDEA-206763 Iteration over keySet quickfix does not take into consideration that the variable name "entry" is already used by a lambda value

java/java-impl/src/com/intellij/psi/impl/source/codeStyle/JavaCodeStyleManagerImpl.java

@@ -1069,6 +1069,7 @@ public class JavaCodeStyleManagerImpl extends JavaCodeStyleManager {
             if (name.equals(variable.getName()) && !canBeReused.test(variable)) {
               throw new CancelException();
             }
+            super.visitVariable(variable);
           }
         });
       }

plugins/InspectionGadgets/test/com/siyeh/igfixes/performance/key_set_with_entry_set/NestedLambdaNameConflict.after.java

@@ -0,0 +1,14 @@
+import java.util.*;
+
+public class NestedLambdaNameConflict {
+  public void test(Map<String, String> m){
+    for(Map.Entry<String, String> e : m.entrySet()) {
+      System.out.println(e.getKey());
+      Foo foo = entry -> entry.getKey().equals(e.getValue());
+    }
+  }
+  
+  interface Foo {
+    boolean doSmth(Map.Entry<String, String> e);
+  }
+}

plugins/InspectionGadgets/test/com/siyeh/igfixes/performance/key_set_with_entry_set/NestedLambdaNameConflict.java

@@ -0,0 +1,14 @@
+import java.util.*;
+
+public class NestedLambdaNameConflict {
+  public void test(Map<String, String> m){
+    for(String k : m.<caret>keySet()) {
+      System.out.println(k);
+      Foo foo = entry -> entry.getKey().equals(m.get(k));
+    }
+  }
+  
+  interface Foo {
+    boolean doSmth(Map.Entry<String, String> e);
+  }
+}

plugins/InspectionGadgets/testsrc/com/siyeh/ig/fixes/performance/KeySetIterationMayUseEntrySetFixTest.java

@@ -52,5 +52,6 @@ public class KeySetIterationMayUseEntrySetFixTest extends IGQuickFixesTestCase {
   public void testLambda() { doTest(CommonQuickFixBundle.message("fix.replace.with.x", "Map.forEach()")); }
   public void testLambdaNoVar() { doTest(CommonQuickFixBundle.message("fix.replace.with.x", "Map.forEach()")); }
   public void testWildcardType() { doTest(CommonQuickFixBundle.message("fix.replace.with.x", "values()")); }
+  public void testNestedLambdaNameConflict() { doTest(CommonQuickFixBundle.message("fix.replace.with.x", "entrySet()")); }
 
 }