extract method type suggestions: suggest more accurate type if casts found (IDEA-56427)

java/java-tests/testData/refactoring/suggestedTypes/CastInside.java

@@ -0,0 +1,7 @@
+class Test {
+  void foo(Object o) {
+    <selection>((A)o).doSmth();</selection>
+  }
+}
+
+class A {void doSmth(){}}

java/java-tests/testData/refactoring/suggestedTypes/CastNoCast.java

@@ -0,0 +1,14 @@
+class Test {
+  void foo(Object o) {
+    <selection>
+    if (true) {
+      ((A1)o).doSmth();
+    } else {
+      o.toString();
+    }
+    </selection>
+  }
+}
+
+class A {void doSmth(){}}
+class A1 extends A {}

java/java-tests/testData/refactoring/suggestedTypes/MultipleCasts.java

@@ -0,0 +1,15 @@
+class Test {
+  void foo(Object o) {
+    <selection>
+    if (true) {
+      ((A1)o).doSmth();
+    } else {
+      ((A2)o).doSmth();
+    }
+    </selection>
+  }
+}
+
+class A {void doSmth(){}}
+class A1 extends A {}
+class A2 extends A {}