Sample application: (with glade)

bug.py:
#!/usr/bin/env python

import pygtk
pygtk.require("2.0")

import gtk
import gtk.glade
import gobject

widgets = gtk.glade.XML("bug.glade")
entry = widgets.get_widget("entry")
window = widgets.get_widget("window1")

def on_button1_clicked(*args):
    entry.insert_text("a",-1)

def on_button2_clicked(*args):
    entry.insert_text("b",-1)

def quit(*args):
    gtk.main_quit()

widgets.signal_autoconnect(locals())

gtk.main()

bug.glade:
<?xml version="1.0" standalone="no"?> <!--*- mode: xml -*-->
<!DOCTYPE glade-interface SYSTEM "http://glade.gnome.org/glade-2.0.dtd">

<glade-interface>

<widget class="GtkWindow" id="window1">
  <property name="visible">True</property>
  <property name="title" translatable="yes">window1</property>
  <property name="type">GTK_WINDOW_TOPLEVEL</property>
  <property name="window_position">GTK_WIN_POS_NONE</property>
  <property name="modal">False</property>
  <property name="resizable">True</property>
  <property name="destroy_with_parent">False</property>
  <signal name="destroy" handler="quit" last_modification_time="Thu,
20 Nov 2003 14:08:16 GMT"/>

  <child>
    <widget class="GtkTable" id="table1">
      <property name="visible">True</property>
      <property name="n_rows">2</property>
      <property name="n_columns">2</property>
      <property name="homogeneous">False</property>
      <property name="row_spacing">0</property>
      <property name="column_spacing">0</property>

      <child>
	<widget class="GtkEntry" id="entry">
	  <property name="visible">True</property>
	  <property name="can_focus">True</property>
	  <property name="has_focus">True</property>
	  <property name="editable">True</property>
	  <property name="visibility">True</property>
	  <property name="max_length">0</property>
	  <property name="text" translatable="yes"></property>
	  <property name="has_frame">True</property>
	  <property name="invisible_char" translatable="yes">*</property>
	  <property name="activates_default">False</property>
	</widget>
	<packing>
	  <property name="left_attach">0</property>
	  <property name="right_attach">2</property>
	  <property name="top_attach">0</property>
	  <property name="bottom_attach">1</property>
	  <property name="y_options"></property>
	</packing>
      </child>

      <child>
	<widget class="GtkButton" id="button1">
	  <property name="visible">True</property>
	  <property name="can_focus">True</property>
	  <property name="label" translatable="yes">button1</property>
	  <property name="use_underline">True</property>
	  <property name="relief">GTK_RELIEF_NORMAL</property>
	  <signal name="clicked" handler="on_button1_clicked"
last_modification_time="Thu, 20 Nov 2003 13:49:14 GMT"/>
	  <accelerator key="1" modifiers="0" signal="activate"/>
	  <accelerator key="KP_1" modifiers="0" signal="activate"/>
	</widget>
	<packing>
	  <property name="left_attach">0</property>
	  <property name="right_attach">1</property>
	  <property name="top_attach">1</property>
	  <property name="bottom_attach">2</property>
	  <property name="x_options">fill</property>
	  <property name="y_options"></property>
	</packing>
      </child>

      <child>
	<widget class="GtkButton" id="button2">
	  <property name="visible">True</property>
	  <property name="can_focus">True</property>
	  <property name="label" translatable="yes">button2</property>
	  <property name="use_underline">True</property>
	  <property name="relief">GTK_RELIEF_NORMAL</property>
	  <signal name="clicked" handler="on_button2_clicked"
last_modification_time="Thu, 20 Nov 2003 13:49:26 GMT"/>
	  <accelerator key="KP_2" modifiers="0" signal="activate"/>
	  <accelerator key="2" modifiers="0" signal="activate"/>
	</widget>
	<packing>
	  <property name="left_attach">1</property>
	  <property name="right_attach">2</property>
	  <property name="top_attach">1</property>
	  <property name="bottom_attach">2</property>
	  <property name="x_options">fill</property>
	  <property name="y_options"></property>
	</packing>
      </child>
    </widget>
  </child>
</widget>

</glade-interface>

Reporter, could you please try a post a shorter (minimal) test case?

Created attachment 22216 [details]
Minimal Test Case

Created attachment 24900 [details]
test program in pure C

This is a gtk+ bug, not pygtk, as the C test program demonstrates.

Moving to GTK+ for retriaging..

This is a consequence of the animation of buttons; I don't
think it is particularly fixable in a reliable way.

Of the *animation* of the buttons? In what way does the animation of
the buttons influence the order callbacks are processed?

Animation of the button, I look at the animation and yes. It looks 
like this:

Button1 down
Button2 down
Button2 up
Button1 up

So the animation order is not right, e.g. the timeout-function 
doesn't handle the timeouts in te right order.
But if a handler is connected to the activate-signal, the signals are 
handled in the right order. So why not chain the clicked signal right 
after the button goes down instead of after the button has gone up?

Because if that were done, you wouldn't be able to change your mind
after clicking (press, move off the buttons target area, release is
intentionally a nop). This is standard HIG fare.

Reopening in case anybody has bright ideas, and so I can
mark another bug as a duplicate. It might actually be
a simple bug, if someone wanted to track down the sequence
of events that was going on.

*** Bug 108209 has been marked as a duplicate of this bug. ***

Can someone test this with threads disabled to check if the threads code
triggers this bug?

closing ancient bugs