Strange problem with image and event box in Windows

[Ari Jolma <ari jolma tkk fi>]

I've got a strange behaviour of an image in an event box in Windows. The 
same code works flawlessly in Linux and the problem is not fatal in 
Windows, just an annoyance.

I maintain a Gtk2::Image, where I put a pixmap, which I create new every 
time the user zooms or pans. The image is in an Gtk2::EventBox, which 
also is created only once. I can easily reproduce the problem by zooming 
into the raster, from which the pixmap is made, a couple of times. The 
image becomes blank and the event box does not receive events (the sub, 
which is connected to the button_press_event does not get executed). If 
I pan a bit in this state (the whole thing is in a scrollable window), 
the image gets recreated and is again shown and everything works. There 
are no warnings or errors. I have tried to debug the situation by adding 
few prints to the code where it creates the pixmap but I can't see 
anything different going on in those cases when the image gets blank 
compared to cases when everything works. The pixmap size is ok for example.

The fact that the event handling does not work at the same time as the 
image creation fails makes me think that the problem might be related to 
GTK.

The Windows port is in MinGW and generally everything else is working. 
(I reported earlier about problems compiling Gtk2, that's with the 
version 1.140, here I'm using 1.120 which I managed to compile with some 
strange hacks a while back)

Any ideas what might be the problem or how to debug?

Ari

--
Prof. Ari Jolma
Geoinformaatio- ja paikannustekniikka
Geoinformation and positioning technology
Teknillinen Korkeakoulu / Helsinki University of Technology
POBox 1200, 02015 TKK, Finland
Email: ari.jolma at tkk.fi URL: http://www.tkk.fi/~jolma