Windows become "sticky" at completely random positions in the screen

[Teo]

When you drag a window, it sometimes "sticks" to a certain vertical position like a magnet. It is expected to do that at meaningful positions, such as when the top of the window is aligned to the top of the screen (minus system bar) or the bottom of the window with the bottom of the screen.

But it does it also at some apparently random and certainly meaningless positions, in the mid of the screen, as if it was sticking to something invisible.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.16.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-31.50-generic 3.2.28
Uname: Linux 3.2.0-31-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu13
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,vpswitch,mousepoll,compiztoolbox,snap,place,resize,session,regex,grid,wall,move,gnomecompat,imgpng,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
Date: Tue Sep 18 23:12:24 2012
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: Upgraded to precise on 2012-05-17 (124 days ago)

[Omer Akram (om26er)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please answer these questions:

* Is this reproducible?
* If so, what specific steps should we take to recreate this bug?

This will help us to find and resolve the problem.

[Teo (teo1978)]

I don't habe a 100%-sure way to reproduce it, but the following reproduces the issue very soon almost surely for me:

- have several windows open, for example: Google Chrome, Thunderbird, a Terminal, a Nautilus window.
- have some of them maximized and some of them not
- resize one of them to a not-too-big size, e.g. about half the dimensions of the screen

- now click on the title bar of this window and drag it around for a while. From time to time stop moving the cursor (without releasing the button) and then start moving again, sometimes slowly, sometimes less slowly, as if "looking for" some spot where it will stick. Soon you will find one.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

Confirmed. I've only seen this happen with wobbly enabled. I saw it happen on a fully updated quantal installation yesterday.

matteo: Do you have wobbly windows enabled?

[Teo (teo1978)]

I don't know what wobbly windows are

[Daniel van Vugt (vanvugt)]

No problem, thanks.