KProgressDialog / QTimer not working during widget construction

[Guillaume Laurent]

I'm having a problem trying to display a KProgressDialog during a long job 
which is done during the construction of a widget. It seems that during that 
time, even if I try to call KApplication::processEvents(), QTimer events are 
held off. I've tried setting a QTimer::singleShot() with a rather small delay 
(.5 secs), and it doesn't go off until after the widget creation is done, 
which takes much more than .5 seconds.

Does anyone has a clue about this problem ?

Here's a link to a modified version of Qt's 'progress' example, which 
demonstrates the problem.

http://telegraph-road.net/tmp/progress_bug.tar.bz2

I've modified it so it uses a KProgressDialog and starts drawing 100k 
rectangles in the widget ctor, while calling processEvents() for each 
rectangle drawn. The KProgressDialog never pops up, and the 2 seconds 
singleshot QTimer which is armed right before the widget's creation fires 
only once the widget is done with the drawing.

Somehow this doesn't look like a bug but more like a deliberate design, but 
I'd like to know why, and mostly if there's a way around it.

-- 
					Guillaume.
					http://www.telegraph-road.org