[Bug 29417] It couldn't modify the graph's colour of resources in system monitor

[heqq]

Public bug reported:
https://launchpad.net/malone/bugs/29417

Affects: gnome-system-monitor (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
1."System Monitor"->"Edit"->"Preferences"->"Resources"->change the background colour and grid colour->close; 
2.Click the tab "Resources",the background and grid colour are still the default colour.not the colour I have just set.

the version is "dapper flight2".