The braille base map leans on glyphs a terminal font may lack; the terminal
draws each missing glyph as a double-width fallback, which shoves the row and
smears the panel's right padding and border. prompt_toolkit's differential
paint models those cells as single-width, so its picture of the screen diverges
from the terminal and it never rewrites the smear.
The previous fix forced a full-frame repaint every paint while in braille mode,
which the 1s header-refresh tick turned into a visible periodic flicker. Replace
it with a targeted scrub: after a move, force just the two right-edge columns
(padding + border) to repaint by poking a sentinel into pt's cached frame. The
map body redraws wholesale as it pans, so its interior self-heals; only the
static edge needed help. Block mode can't smear, so it scrubs nothing.
Also:
- Persist the braille/block mode (app_state.map_block) so the map reopens the
way it was left; braille stays the default.
- Blank the frame on exit (drop pt's cached frame once) so the menu drawn
underneath doesn't inherit leftover braille garbage.
- Reword the t hint to "toggle braille/block".
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 4.8
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