A table constructor sizes its hash part to exactly the keys given, so every
field the wrapper added afterwards could rehash the spec -- twice for the
small ones. type and interactive are now arguments, which also keeps the
tree ignorant of what names handlers go by, and ui.label no longer writes w
and h: tree.create already measures the same text, font and style to size a
text node, so Lua was measuring the string twice to say what C derives.
Press styles are keyed by exception rather than one entry per node, which on
a full screen was an array part recording that almost nothing opts out.
Measured in the emulator, 12 sensors / 131 nodes, against the previous
commit: build 74ms -> 52ms, Lua transient +12.0kB -> +5.7kB, free heap at
build end 27936 -> 36140. Tree footprint is byte-identical throughout.
Two behaviour changes fall out. ui.label used to overwrite an explicit w
with the measured text width, so optionlist's fixed 10px marker gutter was
silently variable and is now the width it asks for. tree.create measured a
label in styleNormal while the painter draws it in the node's textStyle, so
a styled label was sized too narrow; it now measures in the style it paints.
evan
8ceca622b9