Two compounding issues, both pre-existing (this exact <span>-joining
pattern and CSS was carried over unchanged from the old settings.html
preview I moved in the previous commit):
1. Preview lines are joined as adjacent <span> elements with no
separator, so without an explicit block display they render as
one continuous inline line instead of stacked rows.
2. .receipt-preview sits directly in body's flex-column layout and
has overflow-x:auto — per the CSS Flexbox spec, an overflow-bearing
flex item's automatic minimum size becomes 0 instead of its content
size, so the flex column was free to squeeze it down to a sliver
regardless of its 19 lines of content.
Fixes: span{display:block} for the per-line stacking, flex-shrink:0
so the flex column can't shrink it below its content height.
Dave
ec711760a3
