[Bug 1824102] [NEW] Animations leave window artifacts when enabled

[Launchpad Bug Tracker]

You have been subscribed to a public bug by fossfreedom (fossfreedom):

This SRU issue specifically resolves window animation issues caused by
newer versions of mutter - later than the current version in 18.04LTS.

This SRU is part of LP: #1824229 for 18.04 & 18.10 where additional
disco fixes have been backported.

For 19.04, only the animation fix has been applied (see the attached
disco.debdiff)

[Impact]

 * For Cosmic and Disco, animations when enabled leave visible window
artifacts when various budgie window elements are opened and closed such
as menu popovers and alt+tab window..

   This has been reported upstream https://github.com/solus-project
/budgie-desktop/issues/1627

   The issue is due to changes made in mutter 3.30 and later.

 * The Ubuntu Desktop team for Bionic is also proposing to bring in
changes in a proposed mutter release which similarly breaks Ubuntu
Budgie LTS in this area.
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1811900

 * The fix made here is to force a repaint of the window area being
animated.  Current testing have not shown any noticable user facing
impacts such as slow/sluggish animation effects.

[Test Case]
 18.04: Start from current 18.04 Ubuntu Budgie fully up-to-date.

 * Open budgie-desktop-settings - on the Style tab ensure animations is enabled.
   - Open the menu 3 or 4 times.  Note that the menu opens and closes correctly 
   - Open 3 or 4 apps.  Alt+Tab.  Repeat several times. No obvious window artifacts are displayed

 * To upgrade budgie-desktop on 18.04 - Enable the proposed channel.
Install the following packages: budgie-core budgie-desktop
gir1.2-budgie-1.0 libbudgie-plugin0 libbudgietheme0 libraven0

 * After a reboot and login repeat the menu opening and alt+tab actions
above.  Note that animations are still displayed correctly without any
obvious window artifacts being displayed.

18.04 + mutter uplift: enable the proposed repository and install
libmutter-2-0. Reboot.

   - Open the menu 3 or 4 times.  Note that the background edge of the menu remains visible on the desktop but disappears when you move your mouse over the area.
   - Open 3 or 4 apps.  Alt+Tab.  Repeat several times. Most times (not always) the alt+tab window does not fully disappear until the mouse is moved over it.
 * To upgrade budgie-desktop on 18.04 + mutter - with the proposed channel still enabled. Install the following packages: budgie-core budgie-desktop gir1.2-budgie-1.0 libbudgie-plugin0 libbudgietheme0 libraven0

 * After a reboot and login repeat the menu opening and alt+tab actions
above.  Note that animations are displayed correctly without any obvious
window artifacts being displayed.

18.10 & 19.04:

   - Open the menu 3 or 4 times.  Note that the background edge of the menu remains visible on the desktop but disappears when you move your mouse over the area.
   - Open 3 or 4 apps.  Alt+Tab.  Repeat several times. Most times (not always) the alt+tab window does not fully disappear until the mouse is moved over it.
 * To upgrade budgie-desktop on 18.10 & 19.04 - Enable the proposed channel. Install the following packages: budgie-core budgie-desktop gir1.2-budgie-1.0 libbudgie-plugin0 libbudgietheme0 libraven0 libbudgie-private0

 * After a reboot and login repeat the menu opening and alt+tab actions
above.  Note that animations are displayed correctly without any obvious
window artifacts being displayed.

[Regression Potential]

 * The regression potential is that not every budgie animation effect
passes through the code that has been patched and potentially there
could be certain budgie animations that may appear "broken".

   If this unlikely scenario occurs, a further SRU would be required to
resolve edge cases.

   Alternatively, animations can be turned-off as was currently
implemented in in 18.10 & 19.04

 * Testing by the team + independent testing (https://github.com/solus-project/budgie-desktop/issues/1627)
   have not uncovered any issues. Thus we believe the risks are small.

[Other Info]

   Without out this SRU, either the migration of LP: #1811900 will break
budgie animations in 18.04 LTS or it will hold up the mutter migration
until more discovery work is made by upstream budgie developers.

** Affects: budgie-desktop (Ubuntu)
     Importance: High
     Assignee: fossfreedom (fossfreedom)
         Status: In Progress

** Affects: budgie-desktop (Ubuntu Bionic)
     Importance: High
     Assignee: fossfreedom (fossfreedom)
         Status: In Progress

** Affects: budgie-desktop (Ubuntu Cosmic)
     Importance: High
     Assignee: fossfreedom (fossfreedom)
         Status: In Progress

** Affects: budgie-desktop (Ubuntu Disco)
     Importance: High
     Assignee: fossfreedom (fossfreedom)
         Status: In Progress


** Tags: patch
-- 
Animations leave window artifacts when enabled
https://bugs.launchpad.net/bugs/1824102
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