Public bug reported:
Binary package hint: python-qt4
The bug happens when QTreeWidget.expandAll is called. The documentation
warns that expandAll might be slow, but the call itself is not the
problem. The slowdown happens when the user collapses the toplevel
treewidgetitem and then reexpands it. The same behavior appears on
Ubuntu 8.10 32 and 64-bit. Where this problem is not present, expanding
and collapsing the treewidgetitem is very fast.
This bug is NOT present on 8.04. Additionally, with manually built
versions of PyQt and Qt, the problem also does not manifest itself.
I'm attaching a small script that reproduces the problem. To exercise
the bug, run the script and doubleclick the "toplevel" item. The item
should collapse, quickly. Then, doubleclick it again to expand it. This
will take a *long* time (on the order of minutes). On a machine that
does not experience the issue, this expansion is essentially instant.
Here's the information on my system, and relevant package versions.
$ lsb_release -rd
Description: Ubuntu 8.10
Release: 8.10
$ apt-cache policy python-qt4
python-qt4:
Installed: 4.4.3-1ubuntu1
Candidate: 4.4.3-1ubuntu1
Version table:
*** 4.4.3-1ubuntu1 0
500 http://us.archive.ubuntu.com intrepid/main Packages
100 /var/lib/dpkg/status
$ apt-cache policy libqtcore4
libqtcore4:
Installed: 4.4.3-0ubuntu1.1
Candidate: 4.4.3-0ubuntu1.1
Version table:
*** 4.4.3-0ubuntu1.1 0
500 http://us.archive.ubuntu.com intrepid-updates/main Packages
100 /var/lib/dpkg/status
4.4.3-0ubuntu1 0
500 http://us.archive.ubuntu.com intrepid/main Packages
$ apt-cache policy libqtgui4
libqtgui4:
Installed: 4.4.3-0ubuntu1.1
Candidate: 4.4.3-0ubuntu1.1
Version table:
*** 4.4.3-0ubuntu1.1 0
500 http://us.archive.ubuntu.com intrepid-updates/main Packages
100 /var/lib/dpkg/status
4.4.3-0ubuntu1 0
500 http://us.archive.ubuntu.com intrepid/main Packages
** Affects: python-qt4 (Ubuntu)
Importance: Undecided
Status: New
--
Very slow behavior with QTreeWidget on 8.10
https://bugs.launchpad.net/bugs/325605
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