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1efcfcc148
moveMainContextToTop copies the current top view's content into the view
it's promoting, to avoid a flicker. The source can be a main view with a
live streaming task (e.g. resolving a conflict promotes the merge-conflicts
view over a main view that's mid-diff), and CopyContent both read and
published that source's buffer unsafely:
- it read the source's lines/viewLines while locking only the
destination, racing the task's concurrent Write; and
- it aliased the source's row slices into the destination, so the
source's ongoing appends (growslice reading the shared array) and
refreshViewLinesIfNeeded's in-place wrapping-cache writes (&lines[i])
kept racing this view's rendering after the copy.
Lock the source for the read, and shallow-clone the row slices so the
destination gets its own arrays. The per-row cell data is immutable once
written, so it stays shared -- the clone cost is proportional to the
number of rows, not their contents.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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