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[Bug 1035261] Re: Port compiz to gsettings and consequently remove unity-2d


** Description changed:

  Porting compiz and so unity to gsettings has a lot of consequences:
  - compiz:
-   * remove the conffile for 2nd (autologin) fallback mechanism
+   * remove the conffile for 2nd (autologin) fallback mechanism
    * build with gsettings support
    * add migration scripts
    * add xml files for the g-c-c integration (we used the metacity ones before)
  - unity :
    * gconf -> gsettings patches (2)
    * rebuild with the new gsettings compiz
    * add transitional packages for all unity-2d packages
    * add migration scripts
  - nux:
    * remove the X11 Xsession.d detection script
  - gnome-control-center:
   * should be ported in both the keyboard part by reverting the gsettings revert patch
   * in the unity background configuration panels to support gsettings
   * in the display configuration panels to support gsettings
  - gnome-settings-daemon to drop the gsettings revert patch:
  - metacity should be updated to >> 2.34.2 (gsettings integration, shared with compiz). Sync back with debian, demote to universe -> this forces us to drop a lot of patches to make unity-2d running
  - consequently, dropping unity-2d because of metacity patches won't be ported, and unity-2d isn't maintained to port from gconf to gsettings:. Removal from the archive
  - lightdm to transition people from unity-2d to unity-3d session
  - unity-greeter to drop hardware detection capability for nux
  - gnome-session to drop the unity-2d session and recommends
  - release-upgrader in precise to detect if the card can't run unity-3d, and if so, show a warning to tell to stay on the LTS
  - ubuntu-desktop seed to remove dep on unity-2d
  People forcing the upgrade or installing on a machine without hardware
  acceleration will then use unity with llvmpipe.
  ubuntu-release-upgrade -> we will deal that with mvo later on.
  all components that are fix commited (apart unity):
  - bzr pull the vcs and bzr push it
  Unity: Take lp:~didrocks/unity/gsettings-transition as the packaging branch
  - build with latest compiz, check compiz version for build-dep (if not shipped in a new tarball)
  - ship the .convert script for the unity part (sil has it), in a .install
  - ensure this script migrate the HUD key as well.
  - add the dependency on compiz-gnome version shipping the script
  Compiz: take lp:~didrocks/compiz/gsettings-transition as the packaging branch
  rev 3298 introduced the migration script
  - merge all the gsettings branch (create a new snapshot tarball?), ensure they have the xml for g-c-c ones as well. The g-c-c xml files should be installed and handled.
  - ship the transition script use debian/compiz-gnome.migrations (prepared) for that and ship the .convert files as usual (in a .install)
+ 1. have the old g-c-c, change unity values in it (launcher size, hide mode…), change keybindings (a lot of them in different categories, launcher, navigation… like changing workspace keys)
+ 2. install new g-c-c (lp:~ubuntu-desktop/gnome-control-center/ubuntu), compiz, unity with all the settings migration
+ 3. logout/login
+ 4. check that the keys are transitionned to the new system: launcher size/hide mode are the changed values and corresponds and the values are shown in the new g-c-c. Same thing with the changed keybidings.

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  Port compiz to gsettings and consequently remove unity-2d

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