Don't make face property a list if there is only one face
#170
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Currently, the text property
faceis always set to a list, even if there is only one face. This is technically correct, but inefficient, since it creates unnecessary cons cells, which increase GC pressure.Additionally, it affects packages that incorrectly assumes
faceto be a singleton (likeflyspell; see #168).With this change,
faceis not set to a list until there is more than one face.