For Auto Size area type in columns, every text edit, each keystroke of
the Type tool included, laid the text out in one column and then laid
the columns out at that height and at each step of a bisection for the
least height that holds the text. In the release-build timing test
auto_height_in_columns_typing_timing (stories of 5,000 to 50,000
characters at 9 pt in a frame 500 pt wide), a keystroke laid the
columns out 18 to 22 times, and typing at the start of the story of
50,000 characters in 2 columns took 1,670 ms a keystroke.
The bisection now runs on the lines of the one-column layout.
columns_hold computes where those lines would sit in the columns, with
each column's first line at its first baseline below the column's top
(LineInfo::first_baseline, new in vectorcraft-text). The columns are
then laid out at the upper height the bisection ends on and, when they
hold the text there, at the lower one, unless that is the 1 pt it starts
from. When they hold the text at the upper height and not at the lower
one, Auto Size takes the upper height. When taller columns always hold
the text, the old search ends between the same two heights. When the
text wraps around other objects or does not fit the one-column layout,
or when that check fails, the columns are laid out at every step as
before. The same keystroke now takes 292 ms.
Docs: docs/target-app-parity.md.
text.create, text.createInPath, text.setText and text.setStyle answer with
overflow: [id…] for the area type and type on a path whose text doesn't fit (left
out when all fits), and MCP add_text with overflow: true. add_text takes area
type's fit and fitMinPercent.
Area Type Options gain a fit: none, autoHeight (Illustrator's Auto Size:
the frame's height follows the text after every edit, resolved in
refresh_bounds inside the edit so it shares the edit's undo step) and
shrinkText {minPercent} (beyond Illustrator: overflowing text scales its
sizes, leading and baseline shifts down at layout time by the largest
factor, in 0.1 pt steps of the first run, that fits). The Auto Size New
Area Type preference now applies. text.areaOptions and document.inspect
report overflow and the shrink factor; the Area Type Options dialog
offers fit and first baseline as dropdowns.
dotCooCoo