2005-06-29 Peter Bartok <pbartok@novell.com>

2005-06-29  Peter Bartok  <pbartok@novell.com>

	* TextControl.cs:
	  - Selections now work properly, anchoring at the initial location
	    and properly extending in either direction (SetSelectionToCaret(),
	    SetSelectionStart() and SetSelectionEnd())
	  - No longer redraws the whole control on selection change, now
	    calculates delta between previous and new selection and only
	    invalidates/redraws that area
	  - Fixed FindPos() math off-by-one errors
	  - Changed DeleteChars() to verify the provided tag covers the
	    provided position, selections may have a tag that doesn't cover
	    the position if the selection is at a tag border
	  - Fixed off-by-one errors in DeleteChars()
	  - Added missing streamlining check in DeleteChars() to remove
	    zero-length tags
	  - Implemented Invalidate() method, now properly calculates exposures
	    between two given lines/positions
	  - Implemented SetSelection()
	  - Obsoleted and removed FixupSelection()
	  - Improved RecalculateDocument() logic, removing code duplication

svn path=/trunk/mcs/; revision=46746