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Draw truecolor icons using dual-color half blocks

Eden Bynever requested to merge edenbynever/xprop:truecolor-icons into master

The vast majority of monospaced fonts are roughly half as wide as they are tall; to account for this when displaying icons, xprop draws each pixel twice in the horizontal, which nicely evens out the proportions.

This patch utilizes the Lower Half Block character (▄) to obtain the same result in a quarter of the space. By setting both a background and a foreground color, we can draw two pixels per character cell, thereby halving the apparent height of an icon rather than doubling its width.


Signed-off-by: Eden Bynever

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