class: TextView changed: #redrawVisibleLine: #redrawVisibleLine:col: #redrawVisibleLine:from:to: be tolerant to invalid selectionStartCol/endCol should not happen, but some subclass or an aborted edit operation may leave nil there occasionally, which leads to endless exceptions when doing redraws.

LIBRARY         libwidg
DESCRIPTION     'Smalltalk/X Widget Classes'
VERSION         3.5
CODE            EXECUTE READ 
DATA            READ WRITE
SECTIONS
    INITCODE    READ EXECUTE 
    INITDATA    READ WRITE
    RODATA      READ SHARED
EXPORTS 
    _libwidg_Init       @1