kernel: io to stdout shouldn't interfere with prompt #8820
+72
−27
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With this change, the stdout data, e.g. io:format/2, will always be drawn at the line before the prompt, triggering a redraw of the prompt. A buffer is kept so that we can track when the output reaches the column length of the tty, so we can put the cursor at the right position when the next stdout message should be drawn.