If cells A1-C1 are merged and formatted to wrap text, but the amount of text
overflows to more than one row, i.e. requiring the text to wrap, the row
height doesn't auto-resize. Also, double clicking to adjust the row height
doesn't respect wrapped text. It is necessary to manually adjust the row
height - and even then if the row is instructed to set auto height - it
reverts to a single row of text, visually truncating the second and
subsequent rows. Excel ought to be able to correctly adjust row height.
Note: this problem has persisted through the last several versions of MS
Excel, all the way through my current MS Excel 2000.

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