Daniel Bertalan 221ba1aac8 LibVT: Improve scrolling performance ...

Previously, we would remove lines from the buffer, create new lines and
insert them into the buffer when we scrolled. Since scrolling does not
always happen at the last line, this meant `Line` objects were
pointlessly moved forwards, and then immediately backwards.

We now swap them in-place and clear those lines that are "inserted". As
a result, performance is better and scrolling is smoother in `vim` and
`nano`.

2021-06-10 17:18:02 +02:00

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