KDiagram

[Dag]

Hi Friedrich.
First, a big thanks for the enormous amount of work you have put in to 
port to qt5/kf5.

As for KDiagram, I have a few issues.

KChart:
When I remove or add datasets, the labels are not updated. Labels are 
updated if I refresh the chart so it can clearly be fixed from outside 
KChart, so no big issue.

KGantt:
Printing on multiple pages seems to be possible only "horizontally" as I 
can specify a time span to print.
However, if I have more tasks than can fit on one page "vertically" the 
printout is scaled to fit the page. I can't see how I can split this on 
multiple pages.
I think this requires new API.

Zooming in/out switches between different time scales to make it easier 
for user to see where he is. The switching isn't optimal most notably in 
the low end (Day/Hour) and in the high end (Year/Month). Inge made a 
very useful layout for Year/Day in 2.x but KDAB has totally rewritten 
this part of the code so we can't use it :(
They have also added api to add a custom layout, which could be useful, 
but maybe we should make it possible to set layouts for all cases.
I would suspect kontact would have an issue with the Day/Hour layout 
too.

Cheers, Dag