Artifacts in window title bar when title text does not fit window width
On Trisquel 11 Aramo with MATE, when the window title is too long to fit the width of the title bar, black squares or rectangles appear at the beginning and nearby the end of the title, similarly to what was reported there against Marco: https://github.com/mate-desktop/marco/issues/595.
On Trisquel 11, this happens with all available themes except Black MATE, GreenLaguna, Greybird, Greybird-dark, Menta and BlueMenta. At least two reporters where using Intel integrated graphics, but the bug seems to affect only some machines Marco.
- With the Trisquel default theme:
- With the Menta theme:
Ubuntu MATE support issue: https://ubuntu-mate.community/t/ugly-black-squares-on-window-title-bar-in-pluma/23641.
Ubuntu MATE bug report: https://bugs.launchpad.net/ubuntu-mate/+bug/1994170.
UPDATE: I eventually managed to test this on a different machine with a dedicated GPU, and the artifacts reported above are not showing when I am using that dedicated GPU (GeForce GTX 1050-ti), with or without Xpresent. The title text gets properly rounded nearby the end of its dedicated space, filling most of it, and the mysterious boxes are gone. MATE system monitor says "llvmpipe" is used for graphics. I am getting the boxes if I use the Intel integrated graphics available on that machine instead.
UPDATE: the glitches are not present when using the same themes in Xfce (and xfwm4), nor in Cinnamon (Muffin) as reported in the Marco issue tracker.
UPDATE: this has now also been reproduced with AMD Radeon [Radeon HD 6450/7450/8450 / R5 230 OEM] graphics on Ubuntu 22.04, as mentioned in the Marco issue report.