Inconsistent and unexpected window placement behaviour in grid

[Aaron Hastings]

Compiz has very strange and inconsistent behaviour when it comes to corner or "edge resizing" in Ubuntu, i.e. dragging a window to one size of the screen (or, if enabled, a corner).

Expected edge behaviour:

1. Drag window to edge of screen.
2. Window resizes to fill up that half of the desktop.
3. Double-click window title bar to maximize window.
4. Double-click window title bar again to restore window.
5. Window restores back to fill one-half of the desktop.

Recorded edge behaviour:

1 - 4 as expected
5. Window restores to position it was in before it was ever edge-resized.

Expected corner behaviour:

1. Drag window to corner of screen.
2. Window resizes to fill up that quarter of the desktop.
3. Double-click window title bar to maximize window.
4. Double-click window title bar again to restore window.
5. Window restores back to fill one-quarter of the desktop.

Recorded corner behaviour:

1 - 4 as expected.
5. Window restores back to correct corner of the desktop, but with a large "gap" between its top edge and the Unity top bar.

OF NOTE: The above corner behaviour only occurs in the top corner. The bottom corner restores the window as expected.

As we can see, even the incorrect behaviour of the edge and corner resizing is inconsistent. They're both incorrect, but in different ways.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: compiz 1:0.9.12+14.10.20140918-0ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Thu Nov 13 11:48:20 2014
DistUpgraded: 2014-10-23 22:33:27,126 DEBUG enabling apt cron job
DistroCodename: utopic
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:054d]
InstallationDate: Installed on 2014-04-25 (202 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: Dell Inc. XPS L421X
PackageArchitecture: all
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-24-generic.efi.signed root=/dev/mapper/vg_scotty-lv_root ro quiet splash vt.handoff=7
SourcePackage: compiz
UpgradeStatus: Upgraded to utopic on 2014-10-23 (20 days ago)
dmi.bios.date: 12/07/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A13
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A13
dmi.modalias: dmi:bvnDellInc.:bvrA13:bd12/07/2012:svnDellInc.:pnXPSL421X:pvrA13:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvrA13:
dmi.product.name: XPS L421X
dmi.product.version: A13
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.56-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.0-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.0-0ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Wed Nov 12 15:57:40 2014
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 4158
 vendor AUO
xserver.version: 2:1.16.0-1ubuntu1

[Aaron Hastings (thecosmicfrog)]

Neglected to mention - I have attached a video in the first post demonstrating the behaviour.