Please describe the problem:
bad right resize in UML large package containing at least 2 small packages.

When the large package contains only 1 small package the right resize works well

by right resize I mean when resizing from the right side:

 ---------------
|large package  | <- resizing from this size (horizontally) in any direction
 ---------------


this is the case:

- s1, s2, s3 are the small packages in the large packages - the rectangle that
contains them ( preferably put in this order when drawing )

 -----------
| s1  s2 s3  | <- resizing from here
 -----------

whether you resize to the left or to the right the size is not consistent with
the mouse position


NOTE: Similar cases of BAD resize occured when positioning small packages
similar but vertically, or combined ( vertically and horizontally ). in those
cases BAD resize happens in the left, up or down parts.




Steps to reproduce:
1. Select UML -> large package and 
2. Select UML -> small package and place 2 of them in the large package
*horizontally* distanced ( like in the text scheme above - in the description )
3. Try to resize the large package to the right side


Actual results:
Whether you resize to the left or to the right the size is not consistent with
the mouse position.
You can see that the resize is not following the mouse ( as it should -
intuitivelly ). The resize is bigger than the mouse move


Expected results:
The bug should be seen.

Does this happen every time?
yes

Other information:
not really. I think it is enough