stumptray: Adjust icon vertical and horizontal spacing #305
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I found that stumptray drew images too close to each other, so I fixed that by adding an exported parameter tray-icon-spacing to set the icon spacing. I also added some logic behind the default y positioning so that it's not drawn on the little rectangle that stumpwm draws around the mode-line. It's now drawn in the middle of the mode-line.
Before:

After:

The spacing can be modified by doing
In init.lisp.