There is a 2-3 pixel border between the taskbar buttons and the edge of the screen. This makes it much harder to 'hit' the button with the mouse, and therefore makes it harder to use the taskbar to switch between windows. How hard would it be to eliminate this border? Is it a feature of the application or the current theme? Would it be possible to extend the button's active area to the edge of the screen, without changing the aesthetic appearance of the button? (Same comment applies to the panel, too.) Reproducible: Always Steps to Reproduce:
This is already the case for the 4.3 development version of the panel (which now includes the taskbar functionality). It won't be fixed for the current stable series though, so you will have to wait for Xfce 4.4 to become stable. Thanks for the report.