Created attachment 4466 Panel when an empty workspace is shown When the Workspace Switcher shows an empty workspace, i.e. a workspace with no windows that produce miniatures, it shifts one pixel to the right if right aligned. When that happens, it also causes all the other right aligned panel items to shift with it. It shifts back when a workspace with miniature windows is shown again. The method of switching workspaces (click, keyboard shortcut, scrollwheel) doesn't matter. It does not happen if the workspace switcher is left aligned. Attached are two screenshots of the right part of my panel that show this - observe the single pixel column at the right of "°C" (I have of course been very careful to crop the exact same area to show this). This is not a major problem; it's just a bit ugly to have the panel icons judder back and forth. xfce4-panel is 4.10.0-0ubuntu1~ppa1.
Created attachment 4467 Panel when a nonempty workspace is shown
This bug still exists in xfce4-panel 4.12.0 (Xubuntu 16.04). I suspect the problem is actually in the Window Buttons item, not the Workspace Switcher, and is related to the "handle". If "Show handle" is turned on in the Window Buttons settings, the 1-pixel shift goes away. Also, if Window Buttons is removed from the panel entirely, the shift does not happen when switching to an empty workspace.
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