1. taskmanager used to identify which entry should map to window
in x11 environmrnt, listen to xevent in anohter thread, and handle those event
when window create, destory, changed. use some way to identify which entry(desktopfile)
should mapped to changed window.
in wayland, connected plsamawindow signal(window created destoried.
2. use taskmanager instead of dbus in old dock code
log: as title
