With a panel which touches the left (right) edge of the screen, moving the mouse pointer to the left (right) edge of the screen and clicking doesn't activate the applet/launcher at that location. By contrast, with a panel touching the top or bottom edge of the screen, moving the mouse to that edge and clicking will activate the applet at that location, allowing the user to throw the mouse to the edge of the screen without having to aim for a target. The inability to do this for the left or right edges of the screen greatly reduces the usability of panels on the left or right edges of the screen (a setup that's desirable on newer hardware with its stupidly useless 16:9 displays). This is a laptop running xfce4-panel 4.6.4-1 on Debian squeeze x86_64.
I've checked that with xfce4-panel-4.10 and I can click on the plugins when the cursor is exactly at the screen edge (left, top, right, bottom). Possible solutions: - upgrade(?) - AFAIR the panel was rewritten in 4.8 - maybe that's all you need. - use a different theme - some like Clearlooks have padding around buttons (it still works fine in 4.10, though), - if you're currently editing the panel (it displays a red dotted line around it) you will not get the focus at the screen edge because the 1px frame will prevent it. Just close the configuration dialog.
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