I cannot reproduce the bug.
My steps:
- create C/C++ application with C++ main file.
- type class Aaaaaaaaaaaa` in main method, before main method.
Completion works right (there is no series of Aaaa... in the list)

(In reply to Alexander Simon from comment #1)
> I cannot reproduce the bug.
> My steps:
> - create C/C++ application with C++ main file.
> - type class Aaaaaaaaaaaa` in main method, before main method.
> Completion works right (there is no series of Aaaa... in the list)

I can reproduce this bug. Cause is... `return` keyword :D

--->%--->%--->%---

class ffffff //edit there

int main(int argc, char** argv) //errors: unable to resolve `main`, unexpected `int`
{

//	return 0; //comment is required!
}
--->%--->%--->%---

When you start typing new class you cant add `{}` to fix it.

(In reply to Yankes from comment #2)
> (In reply to Alexander Simon from comment #1)
> > I cannot reproduce the bug.
> > My steps:
> > - create C/C++ application with C++ main file.
> > - type class Aaaaaaaaaaaa` in main method, before main method.
> > Completion works right (there is no series of Aaaa... in the list)
> 
> I can reproduce this bug. Cause is... `return` keyword :D
> 
> --->%--->%--->%---
> 
> class ffffff //edit there
> 
> int main(int argc, char** argv) //errors: unable to resolve `main`,
> unexpected `int`
> {
> 
> //	return 0; //comment is required!
> }
> --->%--->%--->%---
> 
> When you start typing new class you cant add `{}` to fix it.
Thanks for test. Problem conformed.
This is a dump of code model with "trash" class forward declarations:
========== Dumping model of PROJECT CppApplication_1
CLASS ff (ff ) [2:1/1-2:12/12] lcurly=10 SCOPE: $Global$ 
    BASE CLASSES:
    MEMBERS:
CLASS fff (fff ) [2:1/1-2:10/10] lcurly=9 SCOPE: $Global$ 
    BASE CLASSES:
    MEMBERS:
CLASS ffff (ffff ) [2:1/1-2:11/11] lcurly=10 SCOPE: $Global$ 
    BASE CLASSES:
    MEMBERS:
CLASS fffff (fffff ) [2:1/1-2:12/12] lcurly=11 SCOPE: $Global$ 
    BASE CLASSES:
    MEMBERS:
CLASS ffffff (ffffff ) [2:1/1-2:13/13] lcurly=12 SCOPE: $Global$ 
    BASE CLASSES:
    MEMBERS:
CLASS fffffff (fffffff ) [2:1/1-2:14/14] lcurly=13 SCOPE: $Global$ 
    BASE CLASSES:
    MEMBERS:
CLASS ffffffff (ffffffff ) [2:1/1-2:15/15] lcurly=14 SCOPE: $Global$ 
    BASE CLASSES:
    MEMBERS:
CLASS fffffffff (fffffffff ) [2:1/1-2:16/16] lcurly=15 SCOPE: $Global$ 
    BASE CLASSES:
    MEMBERS:
CLASS ffffffffff (ffffffffff ) [2:1/1-2:17/17] lcurly=16 SCOPE: $Global$ 
    BASE CLASSES:
    MEMBERS:
CLASS fffffffffff (fffffffffff ) [2:1/1-2:18/18] lcurly=17 SCOPE: $Global$ 
    BASE CLASSES:
    MEMBERS:
CLASS ffffffffffff (ffffffffffff ) [2:1/1-2:19/19] lcurly=18 SCOPE: $Global$ 
    BASE CLASSES:
    MEMBERS:
CLASS fffffffffffff (fffffffffffff ) [2:1/1-2:20/20] lcurly=19 SCOPE: $Global$ 
    BASE CLASSES:
    MEMBERS:
CLASS ffffffffffffff (ffffffffffffff ) [2:1/1-2:21/21] lcurly=20 SCOPE: FUNCTION DEFINITION main  [4:1/27-8:2/155] FunctionDDImpl SCOPE: $Global$ 
    SIGNATURE main(int,char**)
    UNIQUE NAME f:main(int,char**)
    DECLARATION: main  [4:1/27-8:2/155]
    PARAMETERS:
        argc [4:10/36-4:18/44]  TYPE: int TEXT=int  [4:10/36-4:13/39]  INIT: null  SCOPE: main 
        argv [4:20/46-4:31/57]  TYPE: **char TEXT=char**  [4:20/46-4:26/52]  INIT: null  SCOPE: main 
    RETURNS int TEXT=int  [4:1/27-4:4/30]
    STATEMENT COMPOUND  [5:1/112-8:2/155] SCOPE: main **********************

(In reply to Yankes from comment #2)
> When you start typing new class you cant add `{}` to fix it.
There is a nice workaround for you: instead of 
------
class fff
-------
type 
-----
cls 
----
and then just press Tab.
If you'd like to personalize what is inserted, go to Tools->Options->Editor->Code Templates tab and choose C/C++ language
then modify "cls" and "clss" templates