tiresiasfromthebai 9ef82fb898
perf: coalesce Array Visualizer rebuilds and halve scatter restyle ...
In scatter mode a two-array (X/Y) plot rebuilt the table and chart once
per property setter (data, offset, stride) and restyled every marker four
times, so a ~4000-point phase portrait froze for ~0.8s per refresh.
- SeerArrayWidget: add a BulkUpdate RAII guard that defers create() until
a burst of setters completes, so a refresh does one rebuild, not several.
- redecorateScatterSeries: drop the two redundant transparent passes; after
addSeries() the series holds the theme pen/brush, so setPen(NoPen)/
setBrush() are already real transitions and either re-pushes both to the
markers.
~800ms -> ~200ms per refresh at 4000 points; line/spline and marker
appearance unchanged.
Add tests/helloscatter, a 4000-point two-array phase portrait with a
breakpoint loop, to reproduce the slow refresh.
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tiresiasfromthebai
9ef82fb898