perf: introduce reflow for the rendering engine #1863
Merged
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Previously, when the terminal size changed, it required two complete renderings: the first rendered a virtual frame with the new size, and the information from that frame was applied to the second rendering.
This PR introduces the new concept of "reflow", which has almost no overhead compared to rendering, and the actual rendering only needs to happen once, and only the changes detected during reflow will trigger it
Also fixes #1855