There is a painting bug when using colored lines and the new line extra white space. In that case, if the caret is placed in the extra virtual space, at the right of the end of the line, then there is a piece of the backgroung (between the eol and the caret) that is shown using the default background color, not the line background color.

It seems that applying the folowing patch it is fixed:

Index: Editor.cxx

RCS file: /cvsroot/scintilla/scintilla/src/Editor.cxx,v
retrieving revision 1.498
diff -u -r1.498 Editor.cxx
--- Editor.cxx 2 Nov 2009 04:51:51 -0000 1.498
+++ Editor.cxx 15 Dec 2009 09:46:35 -0000
@@ -2256,7 +2256,7 @@
if (virtualSpace) {
rcSegment.left = xEol + xStart;
rcSegment.right = xEol + xStart + virtualSpace;
- surface->FillRectangle(rcSegment, vsDraw.styles[ll->styles[ll->numCharsInLine] & styleMask].back.allocated);
+ surface->FillRectangle(rcSegment, overrideBackground ? background : vsDraw.styles[ll->styles[ll->numCharsInLine] & styleMask].back.allocated);
if (!hideSelection && ((vsDraw.selAlpha == SC_ALPHA_NOALPHA) || (vsDraw.selAdditionalAlpha == SC_ALPHA_NOALPHA))) {
SelectionSegment virtualSpaceRange(SelectionPosition(pdoc->LineEnd(line)), SelectionPosition(pdoc->LineEnd(line), sel.VirtualSpaceFor(pdoc->LineEnd(line))));
for (size_t r=0; r<sel.Count(); r++) {

Thanks,
Jose F. Gimenez