Ali Mohammad Pur 3184086679 LibLine: Avoid excessive write() syscalls when refreshing the display ...

Previously, we were generating the display update one character at a
time, and writing them one at a time to stderr, which is not buffered,
doing so caused one syscall per character printed which is s l o w (TM)
This commit makes LibLine write the update contents into a buffer, and
flush it after all the update is generated :^)

2021-07-20 11:55:42 +04:30

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