Use weight absolute difference in monospace fallback matching #224
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When matching on weights smaller than normal, "equal or smaller"
weight restriction may cause monospace fallback to fail, depending
on font support at such weights for the text to be shaped.
So remove that restriction, and calculate weight differences instead
of offsets.
In case of no exact weight match, and with all other factors being
equal, smaller weights will be picked before bigger ones. So, this
should generally not cause any behavioral changes when matching on
normal weight or bigger.
Should fix pop-os/cosmic-term#104.