scroll past first page

Still some limitations. The text cursor has to be visible on screen, so
if you have a long series of drawings without intervening lines of text
you won't be able to scroll through them all.

1 files changed, 1 insertions, 0 deletions

diff --git a/drawing.lua b/drawing.lua
index be4952e..7047893 100644
--- a/drawing.lua
+++ b/drawing.lua
@@ -177,6 +177,7 @@ end
 
 
 function Drawing.in_drawing(drawing, x,y)
+  if drawing.y == nil then return false end  -- outside current page
   return y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= 16 and x < 16+Drawing_width
 end