complete keyword arguments also for implicitly resolved function calls (PY-5126)

python/testData/completion/keywordArgumentsForImplicitCall.after.py

@@ -0,0 +1,7 @@
+class C:
+    def xyzzy(self, shazam):
+        pass
+
+
+def foo(param):
+    param.xyzzy(shazam=)

python/testData/completion/keywordArgumentsForImplicitCall.py

@@ -0,0 +1,7 @@
+class C:
+    def xyzzy(self, shazam):
+        pass
+
+
+def foo(param):
+    param.xyzzy(sh<caret>)

python/testSrc/com/jetbrains/python/PythonCompletionTest.java

@@ -500,6 +500,10 @@ public class PythonCompletionTest extends PyTestCase {
     doMultiFileTest();
   }
   
+  public void testKeywordArgumentsForImplicitCall() {
+    doTest();
+  }
+  
   public void testTypeMembers() {  // PY-5311
     myFixture.configureByText(PythonFileType.INSTANCE, "a = 'string'\n" +
                                                        "a.<caret>");