A country flag (🇨🇦) is a Regional Indicator pair, not a lone codepoint:
Rich and the terminal draw the pair as one two-cell glyph, but prompt_toolkit
counts each indicator as two (wcwidth), measuring the flag as four and placing
the border two columns short — a worse notch than a lone emoji's one.
Handle flags as a category, not per-country: an indicator is measured as one
cell, so any flag sums to two in both authorities. The indicators are shared
across flags (🇨🇦 and 🇨🇳 both start with C), so listing a single flag would
half-fix its neighbours and skip the rest — the block is the only correct unit.
prompt_toolkit's cache is now always swapped when the renderer draws emoji
narrow (not only when the lone allowlist is non-empty), since flags need it
even with an empty MESHTERM_NARROW_EMOJI.
Add the add-narrow-emoji skill: a classify.py that reports an emoji's
codepoints and its width under wcwidth/Rich/pt (now and fixed) and names the
class + action, plus a SKILL.md procedure. It steers a lone wide codepoint into
the allowlist, recognises flags and VS16 as already handled, and refuses ZWJ /
keycap / modifier clusters (their parts would misalign) — encoding the
per-glyph, confirm-visually, never-blanket discipline.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 4.8
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