edit: make long lines behave nicely

[Lauri Tulmin]

To test this patch launch notepad and type a line long enough for 
horizontal scrolling.
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Index: dlls/user/edit.c
===================================================================
RCS file: /home/wine/wine/dlls/user/edit.c,v
retrieving revision 1.10
diff -u -p -r1.10 edit.c
--- dlls/user/edit.c	23 Dec 2004 17:21:05 -0000	1.10
+++ dlls/user/edit.c	13 Jan 2005 21:16:17 -0000
@@ -2848,7 +2848,7 @@ static BOOL EDIT_EM_LineScroll_internal(
 		dx = es->text_width - x_offset_in_pixels;
 	nyoff = max(0, es->y_offset + dy);
 	if (nyoff >= es->line_count - lines_per_page)
-		nyoff = es->line_count - lines_per_page;
+		nyoff = max(0, es->line_count - lines_per_page);
 	dy = (es->y_offset - nyoff) * es->line_height;
 	if (dx || dy) {
 		RECT rc1;