gtk 2.6.10
debian (tested and does not occur on Windows)
I'm running in to what looks like a pygtk (maybe gtk?) bug having to do with
DnD operations:
If you begin a file drag from a source like Nautilus, then "scrub" the
cursor across a pygtk window expecting a drop, eventually an async will
occur. The more targets you can move in and out of, the faster you get the
error. A drop does not need to occur for the bug to be presented.
Attached is a little demo script that makes the situation obvious, but it
can also be viewed in the dnd demo from pygtk-demo. In the demo, "scrub" as
described. The async is then brought forth on drop by overflowing a stack on
a secondary thread (which does no gtk operations!). If the async does not
occur, you will get a message saying so.
Example output from the attached demo:
Drag a file from a source (like Nautilus) and move it on then off the
window.
Generate about 20 'drag_leave' messages, then drop the file on the window.
File "dragtargets.py", line 21, in drag_leave()
..18 more..
File "dragtargets.py", line 21, in drag_leave()
File "dragtargets.py", line 40, in drag_data_received()
Xlib: unexpected async reply (sequence 0x9cc)!
Example output from pygtk-demo:
motion, source unknown
leave
Xlib: sequence lost (0x1c2f3 > 0xc2f4) in reply type 0x0!
Xlib: sequence lost (0x1c36d > 0xc36e) in reply type 0x0!
motion, source unknown
leave
#!/usr/local/env python
import os
import sys
import urllib
import threading
import pygtk
pygtk.require('2.0')
import gtk
import traceback
def print_tb():
tb = traceback.extract_stack()
file, linenum, func, line = tb[1]
root, file = os.path.split(file)
linenum = str(linenum)
print " File \"" + file + "\", line " + linenum + ", in " + func + "()"
def drag_leave(*args):
print_tb()
def rec_deinc(x):
if x > 0:
rec_deinc(x - 1)
def try_to_overflow(x):
try:
rec_deinc(x)
except:
import traceback
traceback.print_exc(file = open("overflow.txt", "w"))
print "stack overflow (this is expected, do more dragging)"
return
print "could not overflow the stack (increase 'overflow_size')"
def drag_data_received(widget, drag_context, x, y, selection,
target_type, time):
print_tb()
overflow_size = 80000
#try_to_overflow(overflow_size)
t = threading.Thread(target=try_to_overflow, args=(overflow_size,))
t.start()
gtk.threads_init()
print "Drag a file from a source (like Nautilus) and move it on then off the
window."
print "Generate about 20 'drag_leave' messages, then drop the file on the
window."
w = gtk.Window()
w.set_size_request(200, 150)
w.drag_dest_set(gtk.DEST_DEFAULT_ALL,
[('text/uri-list', 0, 1), ],
gtk.gdk.ACTION_MOVE)
w.connect('drag_leave', drag_leave)
w.connect('drag_data_received', drag_data_received)
w.connect('destroy', lambda w: gtk.main_quit())
w.show_all()
gtk.threads_enter()
gtk.main()
gtk.threads_leave()
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