[Pkg-xfce-devel] Bug#708035: liblightdm-qt-2-0: Update to version 1.6.0-3 breaks lightdm-kde-greeter

[Ralf Jung]

Hi again,

> Dear Maintainer,
> 
> after updating the lightdm libraries to version 1.6.0-3, lightdm-kde-greeter (maintained by me) does not work anymore. lightdm-gtk-greeter is all right.
> I do not yet know what this is caused by. Did the ABI change without a soname change? The Ubuntu lightdm-kde-greeter package indicates that the soname was changed there, but I may be mistaken.
Actually, all that seems to be missing is a more tight dependency on
lightdm itself. Yesterday, I updated only the libraries because lightdm
1.6.0-3 pulls in the new glib2.0 from unstable, which I wanted to avoid.
After installing lightdm 1.6.0-3, this bug is gone. So obviously some
dependency is missing somewhere to prevent the combination of
liblightdm-qt 1.6.0-3, lightdm 1.6.0-2 and lightdm-kde-greeter from
happening.
Now, where should this dependency be put? As far as I understand it,
lightdm should Break the current version of lightdm-kde-greeter, and I
can upload a new version which requires lightdm, liblightdm-qt (>=
1.6.0-3) to ensure that the update is installed completely. But I am all
new to this manual dependency business, so any advice is welcome.

Kind regards
Ralf