Below is a copy of my "xrestop" including the gtk-window-decorator. The "Pxms" counter would increase by about 6 each time I alt-Tab back and forth to another window. The "Pxm mem" would also increase. Neither over level off or decrease. So, this bug still exists and the leak makes me have to close my session every day or two. I'm running out of what should be plentiful memory.
The bug still exists in 14.04.1 LTS:
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty
Below is a copy of my "xrestop" including the gtk-window- decorator. The "Pxms" counter would increase by about 6 each time I alt-Tab back and forth to another window. The "Pxm mem" would also increase. Neither over level off or decrease. So, this bug still exists and the leak makes me have to close my session every day or two. I'm running out of what should be plentiful memory.
xrestop - Display: localhost
Monitoring 44 clients. XErrors: 2
Pixmaps: 556734K total, Other: 288K total, All: 557023K total
res-base Wins GCs Fnts Pxms Misc Pxm mem Other Total PID Identifier decorator
2000000 33 65 1 4193 429 481002K 13K 481015K 2423 gtk-window-
2400000 477 3 1 68 9125 43639K 226K 43865K ? Compiz
...