Selection patches

[Serg Stoyan]

Hi,

The following patches changes a way of selected text highlighting (NSTextField,
NSTexView, etc.). Now selected text highlights with 
[NSColor selectedTextBackground] instead of NSHighlightRect().

However it's not finished. Here the things that works:
  - double click selects all text;
  - selecting text by mouse and keyboard(Shift-RightArrow) only from the 
    beginning of the text line (text field);
  - clicking on the text object(e.g NSTextView) unhighlights text;
  - pressing motion keys unhighlits text;
 
Here the things have to do:
  - selecting text inside line;
  - selecting text from the end of line (NSSelectionAffinityUpstream?);

Does anybody has suggestions about TODOs? I don't understand why
selection inside text(not from beginning) doesn't highlights text?

-- 
Serg Stoyan

GSSimpleLayoutManager.m.patch
Description: Text document

NSTextView.m.patch
Description: Text document