[scribus] Enable touchscreen and tablet support

[Jean-François Lemaire]

> Krita, which is mostly KDE, works great doing drawing, selection. Other
> qt based applications seems having similar problem when using a stylus
> for simple tasks like drag and selection.

There are (were) know issues with qt5 and (among others) Wacom tablets. The 
situation improved with latest Qt releases. It's still not perfect with 
Scribus. Krita never exhibited these problems, maybe because it has it's own 
implementation and does not rely on the qt libraries for input? I don't know.

Anyway, if your Qt version is lower than, say, 5.14, try to upgrade and see if 
that helps.

Cheers,
JFL
-- 
Jean-François Lemaire