According to bug reports on Internet [1][2], a simple rebuild should fix the issue.

Please test compiz-0.8.16.1-3.1.mga7 from core/updates_testing.

[1] https://dev.getsol.us/T7830
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1708056

CC: (none) => jani.valimaa

@, Jani: Thank you for picking this up so quickly. Assigning to you as you dealt with it.
I confirmed the fault after installing compiz-decorator-gtk-0.8.16.1-3.mga7
and its dependencies, with compiz-0.8.16.1-3.mga7
 $ compiz-decorator --replace
 Nam yn y rheolydd ffenestri: Could not find a button to strip. n_left = 9 n_right = 7
 Aborted (core dumped)

However, I could not find compiz-0.8.16.1-3.1.mga7 in core/updates_testing to try it.

CC: (none) => lewyssmith
Assignee: bugsquad => jani.valimaa

(In reply to Lewis Smith from comment #2)
> 
> However, I could not find compiz-0.8.16.1-3.1.mga7 in core/updates_testing
> to try it.

Please check again when mirrors are up-to-date. Pkg just finished building.

Thank you Jani.

Updated from core/updates_testing to:
- compiz-0.8.16.1-3.1.mga7.x86_64
- compiz-decorator-gtk-0.8.16.1-3.1.mga7.x86_64

Under Mate desktop:
 $ compiz-decorator --replace              [nothing happened, but no error]
 ^C

@Jehú : it is up to you now to try this update, please, since you obviously have a system with the relevant components. Please report whether the update fixes the problem for you.

See also bug 26453.
In the hope of seeing something happen, I tried:
 $ compiz-decorator ccp --replace
which also did nothing, but did not crash.
This + lack of feedback from Jehú means I am closing this bug OK.

Status: NEW => RESOLVED
Resolution: (none) => FIXED

This update comment 1 never got progressed, and bug 26453 is a consequence of that for straight 'compiz'.

@Jani
Please can you do the bugfix Advisory and pass this to QA. I can invent one if you like, but it might be wrong especially re packages in core/updates testing.
--------------
@QA eventually

See bug 26453 for background about launching compiz. It has already been tested under Mate, so should be quick to test: error on launching, or not.

Compiz from its Tools menu entry, or $ compiz ccp --replace

$ compiz-decorator --replace

Status: RESOLVED => REOPENED
Summary: Mate 1.22 breaks Compiz decorator => Compiz and Compiz decorator broken in Mate 1.22
Resolution: FIXED => (none)

*** Bug 26453 has been marked as a duplicate of this bug. ***

CC: (none) => paul.blackburn

I have just done some more testing. The problem is manifest as there being no window decorations (eg title,  ^ v x missing at top right of windows and right-clicking on the window title does *not* produce a drop down menu.

On attempting to start compiz-decorator:

[mpb@localhost ~]$ compiz-decorator --replace
Bug in window manager: Could not find a button to strip. n_left = 9 n_right = 7
Aborted (core dumped)

[mpb@localhost ~]$ type compiz-decorator
compiz-decorator is hashed (/usr/bin/compiz-decorator)

[mpb@localhost ~]$ rpm -q --whatprovides /usr/bin/compiz-decorator
compiz-0.8.16.1-3.mga7


As a work-around, I tried installing the compiz emerald window decorator.

[mpb@localhost ~]$ type emerald
emerald is /usr/bin/emerald

[mpb@localhost ~]$ rpm -q --whatprovides /usr/bin/emerald
emerald-0.8.16-2.mga7
[mpb@localhost ~]$ 

This is started thusly:
[mpb@localhost ~]$ emerald --replace

While this does work there is clearly a bug with Mageia's compiz-decorator (which works corrrectly in Kali Linux).

Some additional information: screenshots of Mageia and Kali with compiz for comparison. Notice the red coloured "emerald" window decoration in the Mageia image and the MATE window decoration in Kali image.

Mageia: https://i.imgur.com/9qmQCzc.png

Kali: https://i.imgur.com/Bmi6Fy4.png

(In reply to Paul Blackburn from comment #8)
> I have just done some more testing.
Can you do
 $ rpm -q compiz
which should show
 compiz-0.8.16.1-3.1.mga7
and likewise for
 $ rpm -q compiz-decorator-gtk
 compiz-decorator-gtk-0.8.16.1-3.1.mga7
If you do not have these, please get them from Core/updates_testing.

> The problem is manifest as there being
> no window decorations (eg title,  ^ v x missing at top right of windows and
> right-clicking on the window title does *not* produce a drop down menu.
Well, running Mate with compiz-0.8.16.1-3.1, starting Compiz from the Tools menu, I see none of these absences. The windows look almost the same as before, the title bar is complete, right-clicking it does show the usual window menu. The only ways I know compiz is running are:
 $ ps ax | grep compiz
 26482 ?        Sl     0:03 compiz ccp --replace
and the fact that Ctrl/Alt/arrow behaves in a sliding manner.

I will re-start X to give compiz-decorator a clean start.

(In reply to Paul Blackburn from comment #8)
> On attempting to start compiz-decorator:
> [mpb@localhost ~]$ compiz-decorator --replace
> Bug in window manager: Could not find a button to strip. n_left = 9 n_right
> = 7
> Aborted (core dumped)
As I have always found, starting compiz-decorator-gtk-0.8.16.1-3.1
 $ compiz-decorator --replace
or
 $ compiz-decorator ccp --replace
does absolutely nothing; always the terminal command does not return to the prompt, just sits there until Ctrl/C.
 $ ps ax | grep compiz
 $
which is useless, but *it does not give the bugged error and crash*.

> As a work-around, I tried installing the compiz emerald window decorator.
> While this does work there is clearly a bug with Mageia's compiz-decorator
> (which works corrrectly in Kali Linux).
Maybe we should change this bug accordingly. What *should* this package do?

I have just tried launching it with compiz running:
 $ compiz-decorator --replace
and nothing changed: 'ps' still shows just compiz. 

Re the comment 9 screenshots, I found them incomprhensible except for "the red coloured "emerald" window decoration [title bar] in the Mageia image". Are not straight screenshots possible?

Hello Lewis,

I have tested the pending update in Updates testing:

compiz-0.8.16.1-3.1.mga7.x86_64.rpm
compiz-decorator-gtk-0.8.16.1-3.1.mga7.x86_64.rpm

These do fix the current problem with:
[mpb@localhost ~]$ compiz-decorator --replace
Bug in window manager: Could not find a button to strip. n_left = 9 n_right = 7
Aborted (core dumped)

In addition, with compiz running, application windows now have the correct "window decoration": Title bar, "v ^ X" at top right, and right-click on title bar drops down the correct menu.

I made a brief desktop video to show it working: https://youtu.be/QErvBMQIZtQ

My understanding of the compiz-decorator-gtk package is:
"This package provides a GTK window decorator for the compiz OpenGL
compositing manager."

So, we have a minimal working Compiz but there are other Compiz packages available. See also: https://github.com/compiz-reloaded.
eg: compiz-plugins-extra and compiz-plugins-experimental

Thank you very much Paul for the previous comment. That looks like a good test.
We have 'compiz-plugins-main'. If you want to make a formal new package request for 'compiz-plugins-extra' and 'compiz-plugins-experimental', please raise an appropriate bug.
---------------
@Jani: please correct what follows if it is wrong.
-------------------------------------------------
This update needs to go out, so without the proper authority, I am passing this to QA. Easy testing, under Mate. It crashes, it does not! See comment 12.
From comment 1:
In core/updates-testing:
- compiz-0.8.16.1-3.1.mga7.x86_64.rpm
- compiz-decorator-gtk-0.8.16.1-3.1.mga7.x86_64.rpm

SRPM: compiz-0.8.16.1-3.1.mga7.src.rpm

Bugfix advisory needed along the lines of:

Title: compiz & compiz-decorator-gtk crash under Mate
Description: On startup the two programs crashed with the message
"Bug in window manager: Could not find a button to strip. n_left = 9 n_right = 7"
which fault is fixed by this update.

Assignee: jani.valimaa => qa-bugs
Source RPM: compiz-decorator-gtk-1:0.8.16.1-3.mga7 => compiz-0.8.16.1-3.mga7.src.rpm

MGA7-64 MATE on Lenovo B50
No installation issues.
I don't know what to thinkof it, as I never used compiz before.
So before the installation, I have Mate setup, with four workspaces. In 1 I have Firefox, in 2 MCC, in 3 QARepo, in 4 Mate terminal
After the update is installed, the same.
Then I run "Compiz start" from the Tools menu, and then all four windows get into Workspace 1.
And at CLI:
$ compiz-decorator --replace

(gtk-window-decorator:7971): dbind-WARNING **: 11:24:21.460: Couldn't register with accessibility bus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
And the command hangs.

CC: (none) => herman.viaene

Oh yes, when I Ctrl-C to free the terminal, all winddow decorations disappear.

Hello Herman,

Please confirm the versions of compiz and compiz-decorator-gtk you have?

Example:

[user@localhost ~]$ rpm -q compiz compiz-decorator-gtk
compiz-0.8.16.1-3.1.mga7
compiz-decorator-gtk-0.8.16.1-3.1.mga7

Note that the 0.8.16.1-3.1 is the update testing version


One of the things I found with Compiz is that it uses a single (very wide) workspace.

So you can see all the application windows on different MATE workspaces all appear in what looks like the first workspace.

I wrote a script "compiz_position" to re-position the applications I use across the single very wide workspace of compiz so they appear in the "right" surface of the 3D desktop.

I am currently writing a draft wiki page which may help you get more from Compiz.
Please see: https://wiki.mageia.org/en/User:Codegazer/First_step_with_Compiz_fusion

You will find "compiz_position" script in this wiki page.

Confirm it is the 0.8.16.1-3.1 is the update testing version.

Re comment 14: Because the original bug referred only to 'compiz-decorator-gtk', it never occurred to me that this might meant to be run *with* (on top of) straight compiz. Good thinking Herman. This might explain why on its own, it seems to do nothing.
Back to square one?
compiz: an OpenGL compositing manager ... can also be a window manager
compiz-decorator-gtk: provides a GTK window decorator for ... compiz

Under Mate:
$ rpm -qa | grep compiz | sort
 compiz-0.8.16.1-3.1.mga7                 ***
 compiz-ccsm-0.8.16-2.mga7
 compizconfig-0.8.16-2.mga7
 compizconfig-python-0.8.16-3.mga7
 compiz-decorator-gtk-0.8.16.1-3.1.mga7   ***
 compiz-manager-0.7.0-2.mga7
 lib64compizconfig0-0.8.16-2.mga7
 
Start compiz from menu:
 $ ps ax | grep compiz
 1512 ?        Rl     0:02 compiz ccp --replace
Add compiz-decorator:
 $ compiz-decorator --replace
 [no error]
I noticed some too-subtle-to-identify changes, but no new process.
 $ ps ax | grep compiz
 1512 ?        Sl     0:02 compiz ccp --replace

> Ctrl-C to free the terminal, all window decorations disappear.
I found similar, including the title bar & its window control icons. In fact this is reasonable: if you kill the window decorator, what do you expect?

@Herman: why are we seeing different results? Within the obscurities of compiz, Paul & I are finding things work as they 'should'.

@ Lewis:
If I could answer that question, I probably would not have the issue. The only thing I can imagine is this:
I installed this setup with Plasma, Xfce and Mate (you get ICEWM for free anyway). I use almost exclusively Plasma, but I as first action after installation I switch off Compiz and all 3D- and all desktop effects, all of them.
So, I wonder whether this installation is missing some parts to run Compiz successfully. And frankly speaking, I'm not interested at all, so I better leave it.

I follow your sentiments! But this thing has been hanging around for *ages*, so we need to get it out. Otherwise Paul's bug would not have happened. It is a pain that the bug reporter Jehú never gave feedback.

The error you reported in comment 14 may be benign; "the command [$ compiz-decorator --replace] hangs" is normal, it simply does not return. And knowing whether it is in operation, has any effect, is difficult to know. It is clearly of minority interest.

I am OK'ing this, and hope TJ will agree to validate it.

Severity: major => normal
Whiteboard: (none) => MGA7-64-OK

Looks like it's probably OK to me. Validating.

@Lewis: somebody still needs to craft an advisory. 

Thanking everybody for sticking with this one.

Keywords: (none) => validated_update
CC: (none) => andrewsfarm, sysadmin-bugs

I have tested compiz with xfce in Mageia 7 and it is working.

Windows have correct "decoration": title, v^X at top right and right click on title bar displays correct drop-down menu.

[user@localhost ~]$ rpm -q compiz compiz-decorator-gtk
compiz-0.8.16.1-3.1.mga7
compiz-decorator-gtk-0.8.16.1-3.1.mga7

screenshot: https://i.imgur.com/nlmu75V.png

(In reply to Thomas Andrews from comment #21)
> Looks like it's probably OK to me. Validating.
Thanks, I agree. Paul's testing was good (and mine was OK).

> @Lewis: somebody still needs to craft an advisory. 
I drafted one in comment 13, but 'made up' the SRPM. I wish Jani would come back on board to verify it. I will do the advisory if necessary.

Also tested compiz with LXDE in Mageia 7 and it is working.
In ccsm, i have "MATE compatibility" enabled.

Windows have correct "decoration": title, v^X at top right and right click on title bar displays correct drop-down menu.

[user@localhost ~]$ rpm -q compiz compiz-decorator-gtk
compiz-0.8.16.1-3.1.mga7
compiz-decorator-gtk-0.8.16.1-3.1.mga7

brief video: https://www.youtube.com/watch?v=NwuSLcwTERE

Should have posted this at the same time.
Advisory taken from, and corrected a bit, comment 13:
--------
type: bugfix
subject: Updated compiz packages fix broken by Mate 1.22
src:
  7:
   core:
     - compiz-0.8.16.1-3.1.mga7
description: |
  On startup, compiz &  compiz-decorator-gtk failed to start with the
  message "Bug in window manager: Could not find a button to strip.
  n_left = 9 n_right = 7"; which fault is fixed by this update.
references:
 - https://bugs.mageia.org/show_bug.cgi?id=25147
 - https://dev.getsol.us/T7830
 - https://bugzilla.redhat.com/show_bug.cgi?id=1708056

An update for this issue has been pushed to the Mageia Updates repository.

https://advisories.mageia.org/MGAA-2020-0100.html

Status: REOPENED => RESOLVED
Resolution: (none) => FIXED