Panel margins and relative length
Suppose, I want to have 1px border on panel or taskbars, but hide it on the sides adjacent to screen border. Setting negative margin would be the answer, but it does not work with relative panel length.
panel_size = 100% 36 panel_margin = -1 -1
This will hide only long edge border, but length of the panel would still be 100% of the screen dimension, short edge borders still visible.
IMHO, margins should override base of percentage of screen dimensions. So 100% length with margin -1 would be screen dimension + 2px.