Bugfix Tools::CodeView2::GutterView - do not redraw gutter if its not shown.
This actually fixes DNU when CodeView2 is used in diff view. Then the
second gutter is not shown and #yOfTextViewLine: returns nil (bad) which
leads to DNU.
LIBRARY libtool
DESCRIPTION 'Smalltalk/X Programmer Tool Classes'
VERSION 3.5
CODE EXECUTE READ
DATA READ WRITE
SECTIONS
INITCODE READ EXECUTE
INITDATA READ WRITE
EXPORTS
_libtool_Init @1
IMPORTS