Re: BUG: gtksheet row/column title expose events

Adrian E. Feiguin wrote:
> Hi Scott, I appreciate the report, but what would really help is if you 
> could send me a short program that reproduces the problem, maybe 
> tweaking testgtksheet. I don't understand exactly what you are 
> describing, what happens exactly? the child widgets are not updated? 
> what widgets? whose in the title buttons? the labels?

I verified that testgtksheet exhibits a similar behavior. Specifically, 
if you hover the cursor above the row or column title buttons, you'll 
see the cursor flicker. In addition, the CPU usage shoots up to 100%. 
According to the unix utility 'top', 70% is spent in X, and 30% in 
testgtksheet.

Do you see this with gtk-2.6.7 ?


The manifestation in gpsim is that GTK events are effectively blocked. 
The reason is two-fold. gpsim uses the following code to catch up on gtk 
events:

   while(gtk_events_pending())
     gtk_main_iteration();

Now, if there is an event always in the queue, you'll never break out of 
the loop. And since gtk_sheet has a persistently pending expose event, 
gpsim hangs when this loop is encountered.

As far as the child widgets, I thought I was clear in the earlier 
message. The row and column titles in a gtk_sheet are gtk_buttons with 
labels (or something similar I presume). These are child widgets of the 
gtk_container class.  You can see in the second trace dump where 
gtk_sheet_expose there are a chain of calls down to gtk_child_expose. 
You can also see the line number that made the call was 4756 in gtksheet.c.

BTW, I can not duplicate this behavior with either gtk-2.2.x or 
gtk-2.4.x . In fact, I didn't know the problem existed until several 
gpsim users reported it.

Scott


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