Problem description: 

Steps to reproduce:
1. create new spreadsheet;
2. write text into cell A1;
   length of text must be big
   (for example 2000 letters or more);
3. press "expand formula bar" button;
4. try to edit text of cell A1 inside
   "expanded formula bar".

Current behavior:
- some times scroll bar top position
  of "expanded formula bar" is invalid;
  can't scroll to first wrapped line;
- some times textarea top position
  of "expanded formula bar" is invalid;
  can't see top of first wrapped line;
- some times pressing "expand formula bar" button
  cause "hide formula bar";
  to show "formula bar" again,
  use menu item "View" - "Formula bar" two times.

Expected behavior:
calculate valid top position of textarea and scroll bar.

Operating System: Linux (Other)
Version: 4.2.6.2 release