Created attachment 4852 cpu frequency - pager (5 workspaces) - windows menu button Place the cpu frequency on the left before the workspace switcher. If the frequency (1 GHz) changes (to 1,5 GHz), there's the left workspace preview area with temporarily empty (gray box or another old invalid graphical content). See the attachment for an example. I guess the pager doesn't recognize the dynamic move because another plugin (cpu frequency) requests more space and the panel shifts all the plugins to the right.
$ pacman -Q xfce4-panel libwnck xfce4-panel 4.10.0-1 libwnck 2.30.7-1
Yeah, the handler for screen_position_changed is missing. Compare to the windowmenu code. Maybe it should call the wnck_screen_force_update function? "" wnck_screen_force_update () Synchronously and immediately updates the list of WnckWindow on screen. This bypasses the standard update mechanism, where the list of WnckWindow is updated in the idle loop. This is usually a bad idea for both performance and correctness reasons (to get things right, you need to write model-view code that tracks changes, not get a static list of open windows). However, this function can be useful for small applications that just do something and then exit. "" http://developer.gnome.org/libwnck/stable/WnckScreen.html#wnck-screen-force-update
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