Autogenerate screen shots

[niccokunzmann]

The build of OWC can auto-generate screen shots.

• default about page
• default index page
• default calendar

All these screenshots should be generated in a folder from a file with the same name containing the URL path and query. They are pushed to github pages on build.

tox -e screenshots

Also

• configure weblate to use repository paths

See also:

• Visual testing #283