Scrolling with PageUp and PageDown is not smooth
Submitted by Frédéric Parrenin
Steps to reproduce:
- open a large pdf document, for example this one: https://mycore.core-cloud.net/public.php?service=files&t=b54b800b4ad50919bd59ef8aaf2b2450
- try to scroll quickly by dragging the vertical scroll bar => the scrolling is smooth. Indeed, scrolling is a priority action in front of displaying the page. The page frame is displayed first, and then if time allows, the actual content of the page is displayed.
- now try scrolling quickly with PageUp and PageDown repeatedly => now scrolling is not smooth. One sometimes has to wait for the page to be displayed to be able to scroll again.