Resolve "Check permission rules if they handle lessons with substitutions correctly"

Closes #147 (closed)

get_teachers will return the following:

• simply the teachers for events and extra lessons
• the original teachers for lesson periods without substitution, otherwise the new teacher

So, we have to check the teachers of lesson periods additionally to keep the access for the original teacher.

added part::backend type::bug labels

added 1 commit

• c2e98047 - Fix predicates for lesson teachers to check both original teachers and substitution teachers

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assigned to @nik and unassigned @hansegucker

changed the description

marked this merge request as ready

marked this merge request as draft

added workflow::discussing label

marked this merge request as ready

added 1 commit

• 7c0a44c8 - Ensure that original teachers only can view substituted lessons

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@nik Please check again.

removed workflow::discussing label

added 1 commit

• 8f133168 - Add preference for allowing original teachers to edit their substituted lessons

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merged

mentioned in commit e94a0e7a