Opening View Logs with a full 5 MiB buffer laid out the entire log as one
paragraph, freezing the frame for tens of seconds and using ~1 GB of glyph
data — the OS killed the app on low-memory phones and TVs (watchdog/OOM).
Render one Text.rich per entry in a SliverList.builder so only the visible
slice is laid out, keeping selection through a SelectionArea. Also cap the
copy-to-clipboard payload at 256 KiB (newest lines kept) to stay under
Android's ~1 MiB binder transaction limit.
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