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BCE was broken in attempt to optimize row clearing. The fix is to revert
to passing in the current cursor state when clearing.
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Supporting selections with scrollback has two major components:
1. Grid needs access to Selection so that it may update the scroll
position as the terminal text changes.
2. Selection needs to be implemented in terms of buffer offsets -- NOT
lines -- and be updated when Storage is rotated.
This commit implements the first part.
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Things that do not work
- Limiting how far back in the buffer it's possible to scroll
- Selections (need to transform to buffer offsets)
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In addition to a marginal performance improvement, this simplifies some
logic in the Term implementation since now the Grid fully handles row
recycling.
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This is part of some cleanup for the grid module as a whole.
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