window title bars display incorrectly in mutter

[Colin Keenan]

Binary package hint: mutter

Ubuntu 10.04 (lucid), Gnome 2.30.2, Kernal 2.6.32-24-generic, NVIDIA UNIX x86 Kernel Module 173.14.22 Sun Nov 8 20:26:31 PST 2009

mutter:
  Installed: 2.28.1~git20091208-1ubuntu7
  Candidate: 2.28.1~git20091208-1ubuntu7
  Version table:
 *** 2.28.1~git20091208-1ubuntu7 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/universe Packages
        100 /var/lib/dpkg/status

I replaced metacity (which I was running with compositing enabled) with mutter by installing mutter from the Ubuntu Software Center, Alt-F2 mutter --replace, and in gconf-editor set /desktop/gnome/session/required_components/windowmanager to mutter.

It is working because now windows expand onto the screen and collapse horizontally on close.

However, most of the time, the title bars and bottom bars display incorrectly. It seems to place the title bar twice, and the 2nd time it's slightly lower than the first time. Sometimes opening another window will fix the previous one. Also, when switching to a new workspace, windows in the old one fix themselves for a moment, but are wrong when returning back to the old workspace.

In the attached screenshot, I'm using Firefox without a title-bar so it's fine, but I opened the calculator to show the problem. Looking at the title bar and bottom bar on the calculator you can see they have been shifted down slightly overlaying a previous title bar slightly higher and leaving a gap in the border at the bottom.

If it matters, I'm using a custom theme using Radiance controls, New Wave window borders, and custom colors.

[Vallery Lancey (muscovy)]

I have the same problem in Gnome 3 with mutter.

[Ricardo Filipe Moreira (ricardofavmoreira)]

It only affects rounded corners in windows, if the corners are square they're drawn correctly.

[Colin Keenan (colinkeenan)]

I would think mutter uses the same incorrect algorithm to draw the borders whether square or rounded but the mistake is only visible with rounded corners.

[Colin Keenan (colinkeenan)]

I upgraded to Ubuntu 10.10 - The Maverick Meerkat, and the problem is gone. Window borders look fine now.

[Didier Roche-Tolomelli (didrocks)]

good to know, thanks!