Fix emoji aspect ratio by setting explicit width and height #20
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This PR fixes emoji rendering in
geom_emoji()by explicitly setting both width and height on the underlyingrasterGrob()using unit-based dimensions.Previously, emoji size and aspect ratio could vary across devices and plots. By enforcing square dimensions in millimetres, emojis now render consistently.
Trade-off: Because emoji dimensions are now unit-based, users must specify
size(or adjustdefault_aes) to control visible emoji size.Documentation and examples were updated to clarify that the size aesthetic controls the emoji width and height in mm.