Bugs in completion suggestion

[andrei.eremeev]

Hi REPL team,

Bugs in completion suggestion:
1. Nothing is suggested if declaration is not completed (See 
CompletionSuggestionTest#testUncompletedDeclaration).
Examples:
class Clazz { Claz|
class A { int method() { return 0; } int a = meth|

2. Class is suggested in smart completion suggestion while a class 
cannot implement another class:
class A implements Claz|

3. The interface is suggested when it is mentioned in class declaration 
(smart completion):
class A extends Clazz implements Interface, Interf|

Andrei Eremeev