This aligns reflowing much closer to how conpty does it. This was always an issue but only became a big issue recently because conpty 1.22+ opts to passthrough sequences rather than reprinting aggressively. This means that the conpty buffer being in sync with the xterm.js buffer is more important, otherwise the cursor will show up in a seemingly random position. The existing reflow appears to differ somewhat in conpty, like it seems to reflow at the word level, not the character level like xterm.js, but refining that closer if not worth the effort since conpty may end up relying on the terminal's buffer in the future[1]. Fixes #5319 Fixes #3513 Related #4231 Related microsoft/vscode#241978 [1]: https://github.com/microsoft/terminal/blob/main/doc/specs/%2313000%20-%20In-process%20ConPTY.md