_day_columns floor-divided chars*2 by the day count and dropped the
remainder, so the stretched bars often fell short of the width the
axis border and caption assumed — the chart reading as shifted left
of its own axis. Now splits in character units (falling back to plain
dot columns when there are more days than characters) and spreads the
remainder across the oldest days, so the total always lands exactly on
2 x chars.
A day spanning more than one character also opens with a blank dot
column now — the left half of its leading braille cell — so
same-height neighbouring days still read as separate bars instead of
fusing into one solid block.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 4.8
4e8325af08