Improve status bar drawing mechanism (fixes #939) #969
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This is an attempt to improve the situation for #939.
Correctly supporting resize is hard, and with the status bar, even harder.
The reason is that resizing seems quite well supported with the display heuristic. Such a heuristic is required because the terminal is completely messed up when resizing. It's getting worse with the status bar because this causes the terminal to scroll up when the width is reduced.