Andreas Kling 7cc9a18c39 Terminal: Only repaint the lines that actually changed ...

This optimization was broken since who-knows-when. Now we once again do
our best to only repaint the lines that had the "dirty" flag set.

This dramatically reduces the amount of work done by an idle Terminal
since the cursor blinking won't redraw the whole window anymore. :^)

2019-08-13 13:57:04 +02:00

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