Border for group color indicator and some space for tooltip #5190
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Refs #5152
One of my groupcolors is white, which made it hard to see in the jabref window.
I added a thin grey border, so one can see even white groups on white background.
Also I made the area, the user can put his mousepointer in to show the tooltip, a little wider (3 pixels were to small)
left before, right after
ready to review