Extender tutorial on techbase

[Marco Martin]

On Wednesday 10 September 2008, Marco Martin wrote:
> On Wednesday 10 September 2008, Rob Scheepmaker wrote:
> > On Wednesday 10 September 2008 15:02:23 Marco Martin wrote:
> > > another problem:
> > > adding a clock on the desktop when plasma is already started produces a
> > > crash, at line 389 of extenderitem.cpp widget->setParentItem(this);
> > > don't understand why just setting a parent item would crash :-/
> > > instead if the clock is saved in plasma-appletsrc it gets created
> > > without any problems
> >
> > Can you post a backtrace? It might contain some useful information.
>
> sure (yeah, i know, qt symbols missing, i'm awful:)).
> looking at it it seems that someone tries to delete the extenderitem, kinda
> weird
>
with furter investigation i've found that it doesn't crash anymore if i remove 
line 194 of applet.cpp
  //destroy temporary extender items, or items that aren't detached, so their 
  //configuration won't linger after a plasma restart.
  item->destroy();

why items are destroyed when the config is saved? did'nt understand very well 
the logic of this

should i set setAutoExpireDelay(0)?
that would make sense but it's weird, because that problem would arise to 
everybody trying to use extenders in this way?

Cheers,
Marco Martin