Check negative out-of-bounds index in BTextView::OffsetAt(). According to

#4707, this is the BeOS behavior. I have not checked myself and the BeBook is
very brief on this, but similar methods do trim indices to be in range.
Another alternative would be returning an index indicating an error (-1).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33439 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/interface/TextView.cpp

@@ -1913,6 +1913,8 @@ BTextView::OffsetAt(BPoint point) const
 int32
 BTextView::OffsetAt(int32 line) const
 {
+	if (line < 0)
+		return 0;
 	if (line > fLines->NumLines())
 		return fText->Length();