I just want to know what the wnck-applet is, and or what it does.
I located the program at /usr/lib/mate-panel/wnck-applet
man wnck
nothing. googled it, I see folks having problems with it, but nothing saying what it is.
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From my understanding wnck-applet in MATE is legacy of GNOME Panel, before GNOME Shell introducion.
Some clues from Debian codesearch:
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gnome-panel/applets/wncklet/ The actual panel applets based on libwnck (the window list, window selector, workspace switcher and show desktop button) are found in this directory under gnome-panel, and all run as the process "wnck-applet". org.mate.panel.Wncklet.mate-panel-applet.desktop.in.in
... [WindowMenuApplet] Name=Window Selector Description=Switch between open windows using a menu ... MateComponentId=OAFIID:MATE_WindowMenuApplet; ... X-MATE-Bugzilla-OtherBinaries=wnck-applet[WorkspaceSwitcherApplet] Name=Workspace Switcher Description=Switch between workspaces ... MateComponentId=OAFIID:MATE_WorkspaceSwitcherApplet;OAFIID:MATE_PagerApplet; X-MATE-Bugzilla-OtherBinaries=wnck-applet
[WindowListApplet] Name=Window List Description=Switch between open windows using buttons ... MateComponentId=OAFIID:MATE_TasklistApplet;OAFIID:MATE_WindowListApplet; ... X-MATE-Bugzilla-OtherBinaries=wnck-applet
[ShowDesktopApplet] Name=Show Desktop Description=Hide application windows and show the desktop ... MateComponentId=OAFIID:MATE_ShowDesktopApplet; ... X-MATE-Bugzilla-OtherBinaries=wnck-applet
In Ubuntu mate-panel package depends on libwnck-3-0 package, so above assumptions are actual.
As an experiment you can try to run killall wnck-applet on the system with MATE desktop using default settings. It will lead to crashes of the above mentioned applets on the bottom MATE Panel - Show Desktop, Window List and Workspace Switcher (and Window Selector if you have enabled it). Clicking Reload in each Error window will reload wnck-applet and all the functionality will be restored.
N0rbert
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