flap: Add parallax-factor property

This will be needed in certain apps, e.g. in Games to ensure the content
is centered during the over transition.
11 jobs for flap-parallax in 16 minutes and 27 seconds (queued for 1 second)
latest
Status Name Job ID Coverage
  Build
passed api-visibility #1044908

00:00:17

passed build-debian-clang #1044910

00:03:05

passed build-debian-gcc #1044909

00:01:26

passed build-fedora-gcc #1044911

00:04:17

passed build-flatpak #1044912
flatpak

00:05:43

passed build-flatpak-glade #1044913
flatpak

00:07:29

 
  Test+Docs
passed build-gtkdoc #1044914

00:02:24

passed unit-test #1044915

00:02:09

45.5%
 
  Package
passed package-debian-buster #1044916

00:03:47

 
  Test Package
passed autopkgtest-debian-buster-package #1044917

00:02:45

passed lintian-debian-buster-package #1044918

00:00:47