Unfortunately, I think that moving to the new Qt Assistant needs to be an upstream task because their online documentation will also need to migrate to the new format. i.e. we could make a patch for Ubuntu but it wouldn't be able to read the old documentation!
Ah OK,
Unfortunately, I think that moving to the new Qt Assistant needs to be an upstream task because their online documentation will also need to migrate to the new format. i.e. we could make a patch for Ubuntu but it wouldn't be able to read the old documentation!