The "last" action cannot take effect.

[Machine]
Dell Vostro 3900
  [Version]
youker-assistant_2.0.7~ubuntu16.04.1(i386.deb以&amd64.deb)
  [Details]
The "last" action cannot take effect.
  [Test Case]
1. click Feature-->Window, set the Titlebar double-click/middle-click/right-click action as "last"
2. double-click/middle-click/right-click the titlebar
3.check whether the "last" action take effect or not
Expected Result: yes
Actual Result: no

标题栏双击动作、中键动作和右键动作中的last未生效，效果显示为上一次设置的结果