Test of all features involved in do_text()
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Reverse video + red on yellow:       bing! 
Yellow on red should look the same:  bong! 

Basic attrs, combining chars, both widths: Bold blink underline [Λ̊][チ][text]
Wide char should be off by 1 narrow char: Bold blink underline [Λ̊][チ][text]

Double width, double height. Should be red top, magenta bottom, blue DW only:
#3Bold blink underline [Λ̊][チ][text]
#4Bold blink underline [Λ̊][チ][text]
#6Bold blink underline [Λ̊][チ][text]